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// class template regex -- C++ -- // Copyright (C) 2010-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** * @file bits/regex.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{regex} / namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION _GLIBCXX_BEGIN_NAMESPACE_CXX11 template<typename, typename> class basic_regex; template<typename, typename> class match_results; _GLIBCXX_END_NAMESPACE_CXX11 namespace __detail { enum class _RegexExecutorPolicy : int { _S_auto, _S_alternate }; template<typename _BiIter, typename _Alloc, typename _CharT, typename _TraitsT, _RegexExecutorPolicy __policy, bool __match_mode> bool __regex_algo_impl(_BiIter __s, _BiIter __e, match_results<_BiIter, _Alloc>& __m, const basic_regex<_CharT, _TraitsT>& __re, regex_constants::match_flag_type __flags); template<typename, typename, typename, bool> class _Executor; } _GLIBCXX_BEGIN_NAMESPACE_CXX11 /* * @addtogroup regex * @{ / /* * @brief Describes aspects of a regular expression. * * A regular expression traits class that satisfies the requirements of * section [28.7]. * * The class %regex is parameterized around a set of related types and * functions used to complete the definition of its semantics. This class * satisfies the requirements of such a traits class. / template<typename _Ch_type> struct regex_traits { public: typedef _Ch_type char_type; typedef std::basic_string<char_type> string_type; typedef std::locale locale_type; private: struct _RegexMask { typedef std::ctype_base::mask _BaseType; _BaseType _M_base; unsigned char _M_extended; static constexpr unsigned char _S_under = 1 << 0; static constexpr unsigned char _S_valid_mask = 0x1; constexpr _RegexMask(_BaseType __base = 0, unsigned char __extended = 0) : _M_base(__base), _M_extended(__extended) { } constexpr _RegexMask operator&(_RegexMask __other) const { return _RegexMask(_M_base & __other._M_base, _M_extended & __other._M_extended); } constexpr _RegexMask operator\|(_RegexMask __other) const { return _RegexMask(_M_base \| __other._M_base, _M_extended \| __other._M_extended); } constexpr _RegexMask operator^(_RegexMask __other) const { return _RegexMask(_M_base ^ __other._M_base, _M_extended ^ __other._M_extended); } constexpr _RegexMask operator~() const { return _RegexMask(~_M_base, ~_M_extended); } _RegexMask& operator&=(_RegexMask __other) { return this = (this) & __other; } _RegexMask& operator\|=(_RegexMask __other) { return this = (this) \| __other; } _RegexMask& operator^=(_RegexMask __other) { return this = (this) ^ __other; } constexpr bool operator==(_RegexMask __other) const { return (_M_extended & _S_valid_mask) == (__other._M_extended & _S_valid_mask) && _M_base == __other._M_base; } constexpr bool operator!=(_RegexMask __other) const { return !((this) == __other); } }; public: typedef _RegexMask char_class_type; public: /** * @brief Constructs a default traits object. / regex_traits() { } /* * @brief Gives the length of a C-style string starting at @p __p. * * @param __p a pointer to the start of a character sequence. * * @returns the number of characters between @p __p and the first default-initialized value of type @p char_type. In other words, uses * the C-string algorithm for determining the length of a sequence of * characters. / static std::size_t length(const char_type __p) { return string_type::traits_type::length(__p); } /** * @brief Performs the identity translation. * * @param __c A character to the locale-specific character set. * * @returns __c. / char_type translate(char_type __c) const { return __c; } /* * @brief Translates a character into a case-insensitive equivalent. * * @param __c A character to the locale-specific character set. * * @returns the locale-specific lower-case equivalent of __c. * @throws std::bad_cast if the imbued locale does not support the ctype * facet. / char_type translate_nocase(char_type __c) const { typedef std::ctype<char_type> __ctype_type; const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale)); return __fctyp.tolower(__c); } /* * @brief Gets a sort key for a character sequence. * * @param __first beginning of the character sequence. * @param __last one-past-the-end of the character sequence. * * Returns a sort key for the character sequence designated by the * iterator range [F1, F2) such that if the character sequence [G1, G2) * sorts before the character sequence [H1, H2) then * v.transform(G1, G2) < v.transform(H1, H2). * * What this really does is provide a more efficient way to compare a * string to multiple other strings in locales with fancy collation * rules and equivalence classes. * * @returns a locale-specific sort key equivalent to the input range. * * @throws std::bad_cast if the current locale does not have a collate * facet. / template<typename _Fwd_iter> string_type transform(_Fwd_iter __first, _Fwd_iter __last) const { typedef std::collate<char_type> __collate_type; const __collate_type& __fclt(use_facet<__collate_type>(_M_locale)); string_type __s(__first, __last); return __fclt.transform(__s.data(), __s.data() + __s.size()); } /* * @brief Gets a sort key for a character sequence, independent of case. * * @param __first beginning of the character sequence. * @param __last one-past-the-end of the character sequence. * * Effects: if typeid(use_facet<collate<_Ch_type> >) == * typeid(collate_byname<_Ch_type>) and the form of the sort key * returned by collate_byname<_Ch_type>::transform(__first, __last) * is known and can be converted into a primary sort key * then returns that key, otherwise returns an empty string. * * @todo Implement this function correctly. / template<typename _Fwd_iter> string_type transform_primary(_Fwd_iter __first, _Fwd_iter __last) const { // TODO : this is not entirely correct. // This function requires extra support from the platform. // // Read http://gcc.gnu.org/ml/libstdc++/2013-09/msg00117.html and // http://www.open-std.org/Jtc1/sc22/wg21/docs/papers/2003/n1429.htm // for details. typedef std::ctype<char_type> __ctype_type; const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale)); std::vector<char_type> __s(__first, __last); __fctyp.tolower(__s.data(), __s.data() + __s.size()); return this->transform(__s.data(), __s.data() + __s.size()); } /* * @brief Gets a collation element by name. * * @param __first beginning of the collation element name. * @param __last one-past-the-end of the collation element name. * * @returns a sequence of one or more characters that represents the * collating element consisting of the character sequence designated by * the iterator range [__first, __last). Returns an empty string if the * character sequence is not a valid collating element. / template<typename _Fwd_iter> string_type lookup_collatename(_Fwd_iter __first, _Fwd_iter __last) const; /* * @brief Maps one or more characters to a named character * classification. * * @param __first beginning of the character sequence. * @param __last one-past-the-end of the character sequence. * @param __icase ignores the case of the classification name. * * @returns an unspecified value that represents the character * classification named by the character sequence designated by * the iterator range [__first, __last). If @p icase is true, * the returned mask identifies the classification regardless of * the case of the characters to be matched (for example, * [[:lower:]] is the same as [[:alpha:]]), otherwise a * case-dependent classification is returned. The value * returned shall be independent of the case of the characters * in the character sequence. If the name is not recognized then * returns a value that compares equal to 0. * * At least the following names (or their wide-character equivalent) are * supported. * - d * - w * - s * - alnum * - alpha * - blank * - cntrl * - digit * - graph * - lower * - print * - punct * - space * - upper * - xdigit / template<typename _Fwd_iter> char_class_type lookup_classname(_Fwd_iter __first, _Fwd_iter __last, bool __icase = false) const; /* * @brief Determines if @p c is a member of an identified class. * * @param __c a character. * @param __f a class type (as returned from lookup_classname). * * @returns true if the character @p __c is a member of the classification * represented by @p __f, false otherwise. * * @throws std::bad_cast if the current locale does not have a ctype * facet. / bool isctype(_Ch_type __c, char_class_type __f) const; /* * @brief Converts a digit to an int. * * @param __ch a character representing a digit. * @param __radix the radix if the numeric conversion (limited to 8, 10, * or 16). * * @returns the value represented by the digit __ch in base radix if the * character __ch is a valid digit in base radix; otherwise returns -1. / int value(_Ch_type __ch, int __radix) const; /* * @brief Imbues the regex_traits object with a copy of a new locale. * * @param __loc A locale. * * @returns a copy of the previous locale in use by the regex_traits * object. * * @note Calling imbue with a different locale than the one currently in * use invalidates all cached data held by this. / locale_type imbue(locale_type __loc) { std::swap(_M_locale, __loc); return __loc; } /** * @brief Gets a copy of the current locale in use by the regex_traits * object. / locale_type getloc() const { return _M_locale; } protected: locale_type _M_locale; }; // [7.8] Class basic_regex /* * Objects of specializations of this class represent regular expressions * constructed from sequences of character type @p _Ch_type. * * Storage for the regular expression is allocated and deallocated as * necessary by the member functions of this class. / template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>> class basic_regex { public: static_assert(is_same<_Ch_type, typename _Rx_traits::char_type>::value, "regex traits class must have the same char_type"); // types: typedef _Ch_type value_type; typedef _Rx_traits traits_type; typedef typename traits_type::string_type string_type; typedef regex_constants::syntax_option_type flag_type; typedef typename traits_type::locale_type locale_type; /* * @name Constants * std [28.8.1](1) / //@{ static constexpr flag_type icase = regex_constants::icase; static constexpr flag_type nosubs = regex_constants::nosubs; static constexpr flag_type optimize = regex_constants::optimize; static constexpr flag_type collate = regex_constants::collate; static constexpr flag_type ECMAScript = regex_constants::ECMAScript; static constexpr flag_type basic = regex_constants::basic; static constexpr flag_type extended = regex_constants::extended; static constexpr flag_type awk = regex_constants::awk; static constexpr flag_type grep = regex_constants::grep; static constexpr flag_type egrep = regex_constants::egrep; //@} // [7.8.2] construct/copy/destroy /* * Constructs a basic regular expression that does not match any * character sequence. / basic_regex() : _M_flags(ECMAScript), _M_loc(), _M_automaton(nullptr) { } /* * @brief Constructs a basic regular expression from the * sequence [__p, __p + char_traits<_Ch_type>::length(__p)) * interpreted according to the flags in @p __f. * * @param __p A pointer to the start of a C-style null-terminated string * containing a regular expression. * @param __f Flags indicating the syntax rules and options. * * @throws regex_error if @p __p is not a valid regular expression. / explicit basic_regex(const _Ch_type __p, flag_type __f = ECMAScript) : basic_regex(__p, __p + char_traits<_Ch_type>::length(__p), __f) { } /** * @brief Constructs a basic regular expression from the sequence * [p, p + len) interpreted according to the flags in @p f. * * @param __p A pointer to the start of a string containing a regular * expression. * @param __len The length of the string containing the regular * expression. * @param __f Flags indicating the syntax rules and options. * * @throws regex_error if @p __p is not a valid regular expression. / basic_regex(const _Ch_type __p, std::size_t __len, flag_type __f = ECMAScript) : basic_regex(__p, __p + __len, __f) { } /** * @brief Copy-constructs a basic regular expression. * * @param __rhs A @p regex object. / basic_regex(const basic_regex& __rhs) = default; /* * @brief Move-constructs a basic regular expression. * * @param __rhs A @p regex object. / basic_regex(basic_regex&& __rhs) noexcept = default; /* * @brief Constructs a basic regular expression from the string * @p s interpreted according to the flags in @p f. * * @param __s A string containing a regular expression. * @param __f Flags indicating the syntax rules and options. * * @throws regex_error if @p __s is not a valid regular expression. / template<typename _Ch_traits, typename _Ch_alloc> explicit basic_regex(const std::basic_string<_Ch_type, _Ch_traits, _Ch_alloc>& __s, flag_type __f = ECMAScript) : basic_regex(__s.data(), __s.data() + __s.size(), __f) { } /* * @brief Constructs a basic regular expression from the range * [first, last) interpreted according to the flags in @p f. * * @param __first The start of a range containing a valid regular * expression. * @param __last The end of a range containing a valid regular * expression. * @param __f The format flags of the regular expression. * * @throws regex_error if @p [__first, __last) is not a valid regular * expression. / template<typename _FwdIter> basic_regex(_FwdIter __first, _FwdIter __last, flag_type __f = ECMAScript) : basic_regex(std::move(__first), std::move(__last), locale_type(), __f) { } /* * @brief Constructs a basic regular expression from an initializer list. * * @param __l The initializer list. * @param __f The format flags of the regular expression. * * @throws regex_error if @p __l is not a valid regular expression. / basic_regex(initializer_list<_Ch_type> __l, flag_type __f = ECMAScript) : basic_regex(__l.begin(), __l.end(), __f) { } /* * @brief Destroys a basic regular expression. / ~basic_regex() { } /* * @brief Assigns one regular expression to another. / basic_regex& operator=(const basic_regex& __rhs) { return this->assign(__rhs); } /* * @brief Move-assigns one regular expression to another. / basic_regex& operator=(basic_regex&& __rhs) noexcept { return this->assign(std::move(__rhs)); } /* * @brief Replaces a regular expression with a new one constructed from * a C-style null-terminated string. * * @param __p A pointer to the start of a null-terminated C-style string * containing a regular expression. / basic_regex& operator=(const _Ch_type __p) { return this->assign(__p); } /** * @brief Replaces a regular expression with a new one constructed from * an initializer list. * * @param __l The initializer list. * * @throws regex_error if @p __l is not a valid regular expression. / basic_regex& operator=(initializer_list<_Ch_type> __l) { return this->assign(__l.begin(), __l.end()); } /* * @brief Replaces a regular expression with a new one constructed from * a string. * * @param __s A pointer to a string containing a regular expression. / template<typename _Ch_traits, typename _Alloc> basic_regex& operator=(const basic_string<_Ch_type, _Ch_traits, _Alloc>& __s) { return this->assign(__s); } // [7.8.3] assign /* * @brief the real assignment operator. * * @param __rhs Another regular expression object. / basic_regex& assign(const basic_regex& __rhs) { basic_regex __tmp(__rhs); this->swap(__tmp); return this; } /** * @brief The move-assignment operator. * * @param __rhs Another regular expression object. / basic_regex& assign(basic_regex&& __rhs) noexcept { basic_regex __tmp(std::move(__rhs)); this->swap(__tmp); return this; } /** * @brief Assigns a new regular expression to a regex object from a * C-style null-terminated string containing a regular expression * pattern. * * @param __p A pointer to a C-style null-terminated string containing * a regular expression pattern. * @param __flags Syntax option flags. * * @throws regex_error if __p does not contain a valid regular * expression pattern interpreted according to @p __flags. If * regex_error is thrown, this remains unchanged. / basic_regex& assign(const _Ch_type* __p, flag_type __flags = ECMAScript) { return this->assign(string_type(__p), __flags); } /** * @brief Assigns a new regular expression to a regex object from a * C-style string containing a regular expression pattern. * * @param __p A pointer to a C-style string containing a * regular expression pattern. * @param __len The length of the regular expression pattern string. * @param __flags Syntax option flags. * * @throws regex_error if p does not contain a valid regular * expression pattern interpreted according to @p __flags. If * regex_error is thrown, this remains unchanged. / basic_regex& assign(const _Ch_type* __p, std::size_t __len, flag_type __flags) { return this->assign(string_type(__p, __len), __flags); } /** * @brief Assigns a new regular expression to a regex object from a * string containing a regular expression pattern. * * @param __s A string containing a regular expression pattern. * @param __flags Syntax option flags. * * @throws regex_error if __s does not contain a valid regular * expression pattern interpreted according to @p __flags. If * regex_error is thrown, this remains unchanged. / template<typename _Ch_traits, typename _Alloc> basic_regex& assign(const basic_string<_Ch_type, _Ch_traits, _Alloc>& __s, flag_type __flags = ECMAScript) { return this->assign(basic_regex(__s.data(), __s.data() + __s.size(), _M_loc, __flags)); } /** * @brief Assigns a new regular expression to a regex object. * * @param __first The start of a range containing a valid regular * expression. * @param __last The end of a range containing a valid regular * expression. * @param __flags Syntax option flags. * * @throws regex_error if p does not contain a valid regular * expression pattern interpreted according to @p __flags. If * regex_error is thrown, the object remains unchanged. / template<typename _InputIterator> basic_regex& assign(_InputIterator __first, _InputIterator __last, flag_type __flags = ECMAScript) { return this->assign(string_type(__first, __last), __flags); } /* * @brief Assigns a new regular expression to a regex object. * * @param __l An initializer list representing a regular expression. * @param __flags Syntax option flags. * * @throws regex_error if @p __l does not contain a valid * regular expression pattern interpreted according to @p * __flags. If regex_error is thrown, the object remains * unchanged. / basic_regex& assign(initializer_list<_Ch_type> __l, flag_type __flags = ECMAScript) { return this->assign(__l.begin(), __l.end(), __flags); } // [7.8.4] const operations /* * @brief Gets the number of marked subexpressions within the regular * expression. / unsigned int mark_count() const { if (_M_automaton) return _M_automaton->_M_sub_count() - 1; return 0; } /* * @brief Gets the flags used to construct the regular expression * or in the last call to assign(). / flag_type flags() const { return _M_flags; } // [7.8.5] locale /* * @brief Imbues the regular expression object with the given locale. * * @param __loc A locale. / locale_type imbue(locale_type __loc) { std::swap(__loc, _M_loc); _M_automaton.reset(); return __loc; } /* * @brief Gets the locale currently imbued in the regular expression * object. / locale_type getloc() const { return _M_loc; } // [7.8.6] swap /* * @brief Swaps the contents of two regular expression objects. * * @param __rhs Another regular expression object. / void swap(basic_regex& __rhs) { std::swap(_M_flags, __rhs._M_flags); std::swap(_M_loc, __rhs._M_loc); std::swap(_M_automaton, __rhs._M_automaton); } #ifdef _GLIBCXX_DEBUG void _M_dot(std::ostream& __ostr) { _M_automaton->_M_dot(__ostr); } #endif private: typedef std::shared_ptr<const __detail::_NFA<_Rx_traits>> _AutomatonPtr; template<typename _FwdIter> basic_regex(_FwdIter __first, _FwdIter __last, locale_type __loc, flag_type __f) : _M_flags(__f), _M_loc(std::move(__loc)), _M_automaton(__detail::__compile_nfa<_Rx_traits>( std::move(__first), std::move(__last), _M_loc, _M_flags)) { } template<typename _Bp, typename _Ap, typename _Cp, typename _Rp, __detail::_RegexExecutorPolicy, bool> friend bool __detail::__regex_algo_impl(_Bp, _Bp, match_results<_Bp, _Ap>&, const basic_regex<_Cp, _Rp>&, regex_constants::match_flag_type); template<typename, typename, typename, bool> friend class __detail::_Executor; flag_type _M_flags; locale_type _M_loc; _AutomatonPtr _M_automaton; }; #if __cplusplus < 201703L template<typename _Ch, typename _Tr> constexpr regex_constants::syntax_option_type basic_regex<_Ch, _Tr>::icase; template<typename _Ch, typename _Tr> constexpr regex_constants::syntax_option_type basic_regex<_Ch, _Tr>::nosubs; template<typename _Ch, typename _Tr> constexpr regex_constants::syntax_option_type basic_regex<_Ch, _Tr>::optimize; template<typename _Ch, typename _Tr> constexpr regex_constants::syntax_option_type basic_regex<_Ch, _Tr>::collate; template<typename _Ch, typename _Tr> constexpr regex_constants::syntax_option_type basic_regex<_Ch, _Tr>::ECMAScript; template<typename _Ch, typename _Tr> constexpr regex_constants::syntax_option_type basic_regex<_Ch, _Tr>::basic; template<typename _Ch, typename _Tr> constexpr regex_constants::syntax_option_type basic_regex<_Ch, _Tr>::extended; template<typename _Ch, typename _Tr> constexpr regex_constants::syntax_option_type basic_regex<_Ch, _Tr>::awk; template<typename _Ch, typename _Tr> constexpr regex_constants::syntax_option_type basic_regex<_Ch, _Tr>::grep; template<typename _Ch, typename _Tr> constexpr regex_constants::syntax_option_type basic_regex<_Ch, _Tr>::egrep; #endif // ! C++17 #if __cpp_deduction_guides >= 201606 template<typename _ForwardIterator> basic_regex(_ForwardIterator, _ForwardIterator, regex_constants::syntax_option_type = {}) -> basic_regex<typename iterator_traits<_ForwardIterator>::value_type>; #endif /* @brief Standard regular expressions. / typedef basic_regex<char> regex; #ifdef _GLIBCXX_USE_WCHAR_T /* @brief Standard wide-character regular expressions. / typedef basic_regex<wchar_t> wregex; #endif // [7.8.6] basic_regex swap /* * @brief Swaps the contents of two regular expression objects. * @param __lhs First regular expression. * @param __rhs Second regular expression. / template<typename _Ch_type, typename _Rx_traits> inline void swap(basic_regex<_Ch_type, _Rx_traits>& __lhs, basic_regex<_Ch_type, _Rx_traits>& __rhs) { __lhs.swap(__rhs); } // [7.9] Class template sub_match /* * A sequence of characters matched by a particular marked sub-expression. * * An object of this class is essentially a pair of iterators marking a * matched subexpression within a regular expression pattern match. Such * objects can be converted to and compared with std::basic_string objects * of a similar base character type as the pattern matched by the regular * expression. * * The iterators that make up the pair are the usual half-open interval * referencing the actual original pattern matched. / template<typename _BiIter> class sub_match : public std::pair<_BiIter, _BiIter> { typedef iterator_traits<_BiIter> __iter_traits; public: typedef typename __iter_traits::value_type value_type; typedef typename __iter_traits::difference_type difference_type; typedef _BiIter iterator; typedef std::basic_string<value_type> string_type; bool matched; constexpr sub_match() : matched() { } /* * Gets the length of the matching sequence. / difference_type length() const { return this->matched ? std::distance(this->first, this->second) : 0; } /* * @brief Gets the matching sequence as a string. * * @returns the matching sequence as a string. * * This is the implicit conversion operator. It is identical to the * str() member function except that it will want to pop up in * unexpected places and cause a great deal of confusion and cursing * from the unwary. / operator string_type() const { return this->matched ? string_type(this->first, this->second) : string_type(); } /* * @brief Gets the matching sequence as a string. * * @returns the matching sequence as a string. / string_type str() const { return this->matched ? string_type(this->first, this->second) : string_type(); } /* * @brief Compares this and another matched sequence. * * @param __s Another matched sequence to compare to this one. * * @retval <0 this matched sequence will collate before @p __s. * @retval =0 this matched sequence is equivalent to @p __s. * @retval <0 this matched sequence will collate after @p __s. / int compare(const sub_match& __s) const { return this->str().compare(__s.str()); } /* * @brief Compares this sub_match to a string. * * @param __s A string to compare to this sub_match. * * @retval <0 this matched sequence will collate before @p __s. * @retval =0 this matched sequence is equivalent to @p __s. * @retval <0 this matched sequence will collate after @p __s. / int compare(const string_type& __s) const { return this->str().compare(__s); } /* * @brief Compares this sub_match to a C-style string. * * @param __s A C-style string to compare to this sub_match. * * @retval <0 this matched sequence will collate before @p __s. * @retval =0 this matched sequence is equivalent to @p __s. * @retval <0 this matched sequence will collate after @p __s. / int compare(const value_type __s) const { return this->str().compare(__s); } }; /** @brief Standard regex submatch over a C-style null-terminated string. / typedef sub_match<const char> csub_match; /** @brief Standard regex submatch over a standard string. / typedef sub_match<string::const_iterator> ssub_match; #ifdef _GLIBCXX_USE_WCHAR_T /* @brief Regex submatch over a C-style null-terminated wide string. / typedef sub_match<const wchar_t> wcsub_match; /** @brief Regex submatch over a standard wide string. / typedef sub_match<wstring::const_iterator> wssub_match; #endif // [7.9.2] sub_match non-member operators /* * @brief Tests the equivalence of two regular expression submatches. * @param __lhs First regular expression submatch. * @param __rhs Second regular expression submatch. * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise. / template<typename _BiIter> inline bool operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs) { return __lhs.compare(__rhs) == 0; } /* * @brief Tests the inequivalence of two regular expression submatches. * @param __lhs First regular expression submatch. * @param __rhs Second regular expression submatch. * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise. / template<typename _BiIter> inline bool operator!=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs) { return __lhs.compare(__rhs) != 0; } /* * @brief Tests the ordering of two regular expression submatches. * @param __lhs First regular expression submatch. * @param __rhs Second regular expression submatch. * @returns true if @a __lhs precedes @a __rhs, false otherwise. / template<typename _BiIter> inline bool operator<(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs) { return __lhs.compare(__rhs) < 0; } /* * @brief Tests the ordering of two regular expression submatches. * @param __lhs First regular expression submatch. * @param __rhs Second regular expression submatch. * @returns true if @a __lhs does not succeed @a __rhs, false otherwise. / template<typename _BiIter> inline bool operator<=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs) { return __lhs.compare(__rhs) <= 0; } /* * @brief Tests the ordering of two regular expression submatches. * @param __lhs First regular expression submatch. * @param __rhs Second regular expression submatch. * @returns true if @a __lhs does not precede @a __rhs, false otherwise. / template<typename _BiIter> inline bool operator>=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs) { return __lhs.compare(__rhs) >= 0; } /* * @brief Tests the ordering of two regular expression submatches. * @param __lhs First regular expression submatch. * @param __rhs Second regular expression submatch. * @returns true if @a __lhs succeeds @a __rhs, false otherwise. / template<typename _BiIter> inline bool operator>(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs) { return __lhs.compare(__rhs) > 0; } // Alias for sub_match'd string. template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc> using __sub_match_string = basic_string< typename iterator_traits<_Bi_iter>::value_type, _Ch_traits, _Ch_alloc>; /* * @brief Tests the equivalence of a string and a regular expression * submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc> inline bool operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs, const sub_match<_Bi_iter>& __rhs) { typedef typename sub_match<_Bi_iter>::string_type string_type; return __rhs.compare(string_type(__lhs.data(), __lhs.size())) == 0; } /* * @brief Tests the inequivalence of a string and a regular expression * submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc> inline bool operator!=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs, const sub_match<_Bi_iter>& __rhs) { return !(__lhs == __rhs); } /* * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs precedes @a __rhs, false otherwise. / template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc> inline bool operator<(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs, const sub_match<_Bi_iter>& __rhs) { typedef typename sub_match<_Bi_iter>::string_type string_type; return __rhs.compare(string_type(__lhs.data(), __lhs.size())) > 0; } /* * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs succeeds @a __rhs, false otherwise. / template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc> inline bool operator>(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs, const sub_match<_Bi_iter>& __rhs) { return __rhs < __lhs; } /* * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs does not precede @a __rhs, false otherwise. / template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc> inline bool operator>=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs, const sub_match<_Bi_iter>& __rhs) { return !(__lhs < __rhs); } /* * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs does not succeed @a __rhs, false otherwise. / template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc> inline bool operator<=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs, const sub_match<_Bi_iter>& __rhs) { return !(__rhs < __lhs); } /* * @brief Tests the equivalence of a regular expression submatch and a * string. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc> inline bool operator==(const sub_match<_Bi_iter>& __lhs, const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs) { typedef typename sub_match<_Bi_iter>::string_type string_type; return __lhs.compare(string_type(__rhs.data(), __rhs.size())) == 0; } /* * @brief Tests the inequivalence of a regular expression submatch and a * string. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc> inline bool operator!=(const sub_match<_Bi_iter>& __lhs, const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs) { return !(__lhs == __rhs); } /* * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs precedes @a __rhs, false otherwise. / template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc> inline bool operator<(const sub_match<_Bi_iter>& __lhs, const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs) { typedef typename sub_match<_Bi_iter>::string_type string_type; return __lhs.compare(string_type(__rhs.data(), __rhs.size())) < 0; } /* * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs succeeds @a __rhs, false otherwise. / template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc> inline bool operator>(const sub_match<_Bi_iter>& __lhs, const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs) { return __rhs < __lhs; } /* * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs does not precede @a __rhs, false otherwise. / template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc> inline bool operator>=(const sub_match<_Bi_iter>& __lhs, const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs) { return !(__lhs < __rhs); } /* * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs does not succeed @a __rhs, false otherwise. / template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc> inline bool operator<=(const sub_match<_Bi_iter>& __lhs, const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs) { return !(__rhs < __lhs); } /* * @brief Tests the equivalence of a C string and a regular expression * submatch. * @param __lhs A C string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator==(typename iterator_traits<_Bi_iter>::value_type const __lhs, const sub_match<_Bi_iter>& __rhs) { return __rhs.compare(__lhs) == 0; } /** * @brief Tests the inequivalence of an iterator value and a regular * expression submatch. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator!=(typename iterator_traits<_Bi_iter>::value_type const __lhs, const sub_match<_Bi_iter>& __rhs) { return !(__lhs == __rhs); } /** * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs precedes @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator<(typename iterator_traits<_Bi_iter>::value_type const __lhs, const sub_match<_Bi_iter>& __rhs) { return __rhs.compare(__lhs) > 0; } /** * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs succeeds @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator>(typename iterator_traits<_Bi_iter>::value_type const __lhs, const sub_match<_Bi_iter>& __rhs) { return __rhs < __lhs; } /** * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs does not precede @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator>=(typename iterator_traits<_Bi_iter>::value_type const __lhs, const sub_match<_Bi_iter>& __rhs) { return !(__lhs < __rhs); } /** * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs does not succeed @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator<=(typename iterator_traits<_Bi_iter>::value_type const __lhs, const sub_match<_Bi_iter>& __rhs) { return !(__rhs < __lhs); } /** * @brief Tests the equivalence of a regular expression submatch and a * string. * @param __lhs A regular expression submatch. * @param __rhs A pointer to a string? * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator==(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const __rhs) { return __lhs.compare(__rhs) == 0; } /** * @brief Tests the inequivalence of a regular expression submatch and a * string. * @param __lhs A regular expression submatch. * @param __rhs A pointer to a string. * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator!=(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const __rhs) { return !(__lhs == __rhs); } /** * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs precedes @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator<(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const __rhs) { return __lhs.compare(__rhs) < 0; } /** * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs succeeds @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator>(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const __rhs) { return __rhs < __lhs; } /** * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs does not precede @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator>=(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const __rhs) { return !(__lhs < __rhs); } /** * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A string. * @returns true if @a __lhs does not succeed @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator<=(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const __rhs) { return !(__rhs < __lhs); } /** * @brief Tests the equivalence of a string and a regular expression * submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs, const sub_match<_Bi_iter>& __rhs) { typedef typename sub_match<_Bi_iter>::string_type string_type; return __rhs.compare(string_type(1, __lhs)) == 0; } /* * @brief Tests the inequivalence of a string and a regular expression * submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator!=(typename iterator_traits<_Bi_iter>::value_type const& __lhs, const sub_match<_Bi_iter>& __rhs) { return !(__lhs == __rhs); } /* * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs precedes @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator<(typename iterator_traits<_Bi_iter>::value_type const& __lhs, const sub_match<_Bi_iter>& __rhs) { typedef typename sub_match<_Bi_iter>::string_type string_type; return __rhs.compare(string_type(1, __lhs)) > 0; } /* * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs succeeds @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator>(typename iterator_traits<_Bi_iter>::value_type const& __lhs, const sub_match<_Bi_iter>& __rhs) { return __rhs < __lhs; } /* * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs does not precede @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator>=(typename iterator_traits<_Bi_iter>::value_type const& __lhs, const sub_match<_Bi_iter>& __rhs) { return !(__lhs < __rhs); } /* * @brief Tests the ordering of a string and a regular expression submatch. * @param __lhs A string. * @param __rhs A regular expression submatch. * @returns true if @a __lhs does not succeed @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator<=(typename iterator_traits<_Bi_iter>::value_type const& __lhs, const sub_match<_Bi_iter>& __rhs) { return !(__rhs < __lhs); } /* * @brief Tests the equivalence of a regular expression submatch and a * string. * @param __lhs A regular expression submatch. * @param __rhs A const string reference. * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator==(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const& __rhs) { typedef typename sub_match<_Bi_iter>::string_type string_type; return __lhs.compare(string_type(1, __rhs)) == 0; } /* * @brief Tests the inequivalence of a regular expression submatch and a * string. * @param __lhs A regular expression submatch. * @param __rhs A const string reference. * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator!=(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const& __rhs) { return !(__lhs == __rhs); } /* * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A const string reference. * @returns true if @a __lhs precedes @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator<(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const& __rhs) { typedef typename sub_match<_Bi_iter>::string_type string_type; return __lhs.compare(string_type(1, __rhs)) < 0; } /* * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A const string reference. * @returns true if @a __lhs succeeds @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator>(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const& __rhs) { return __rhs < __lhs; } /* * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A const string reference. * @returns true if @a __lhs does not precede @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator>=(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const& __rhs) { return !(__lhs < __rhs); } /* * @brief Tests the ordering of a regular expression submatch and a string. * @param __lhs A regular expression submatch. * @param __rhs A const string reference. * @returns true if @a __lhs does not succeed @a __rhs, false otherwise. / template<typename _Bi_iter> inline bool operator<=(const sub_match<_Bi_iter>& __lhs, typename iterator_traits<_Bi_iter>::value_type const& __rhs) { return !(__rhs < __lhs); } /* * @brief Inserts a matched string into an output stream. * * @param __os The output stream. * @param __m A submatch string. * * @returns the output stream with the submatch string inserted. / template<typename _Ch_type, typename _Ch_traits, typename _Bi_iter> inline basic_ostream<_Ch_type, _Ch_traits>& operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os, const sub_match<_Bi_iter>& __m) { return __os << __m.str(); } // [7.10] Class template match_results /* * @brief The results of a match or search operation. * * A collection of character sequences representing the result of a regular * expression match. Storage for the collection is allocated and freed as * necessary by the member functions of class template match_results. * * This class satisfies the Sequence requirements, with the exception that * only the operations defined for a const-qualified Sequence are supported. * * The sub_match object stored at index 0 represents sub-expression 0, i.e. * the whole match. In this case the %sub_match member matched is always true. * The sub_match object stored at index n denotes what matched the marked * sub-expression n within the matched expression. If the sub-expression n * participated in a regular expression match then the %sub_match member * matched evaluates to true, and members first and second denote the range * of characters [first, second) which formed that match. Otherwise matched * is false, and members first and second point to the end of the sequence * that was searched. * * @nosubgrouping / template<typename _Bi_iter, typename _Alloc = allocator<sub_match<_Bi_iter> > > class match_results : private std::vector<sub_match<_Bi_iter>, _Alloc> { private: / * The vector base is empty if this does not represent a match (!ready()); * Otherwise if it's a match failure, it contains 3 elements: * [0] unmatched * [1] prefix * [2] suffix * Otherwise it contains n+4 elements where n is the number of marked * sub-expressions: * [0] entire match * [1] 1st marked subexpression * ... * [n] nth marked subexpression * [n+1] unmatched * [n+2] prefix * [n+3] suffix / typedef std::vector<sub_match<_Bi_iter>, _Alloc> _Base_type; typedef std::iterator_traits<_Bi_iter> __iter_traits; typedef regex_constants::match_flag_type match_flag_type; public: /* * @name 10.? Public Types / //@{ typedef sub_match<_Bi_iter> value_type; typedef const value_type& const_reference; typedef value_type& reference; typedef typename _Base_type::const_iterator const_iterator; typedef const_iterator iterator; typedef typename __iter_traits::difference_type difference_type; typedef typename allocator_traits<_Alloc>::size_type size_type; typedef _Alloc allocator_type; typedef typename __iter_traits::value_type char_type; typedef std::basic_string<char_type> string_type; //@} public: /* * @name 28.10.1 Construction, Copying, and Destruction / //@{ /* * @brief Constructs a default %match_results container. * @post size() returns 0 and str() returns an empty string. / explicit match_results(const _Alloc& __a = _Alloc()) : _Base_type(__a) { } /* * @brief Copy constructs a %match_results. / match_results(const match_results& __rhs) = default; /* * @brief Move constructs a %match_results. / match_results(match_results&& __rhs) noexcept = default; /* * @brief Assigns rhs to this. / match_results& operator=(const match_results& __rhs) = default; /** * @brief Move-assigns rhs to this. / match_results& operator=(match_results&& __rhs) = default; /** * @brief Destroys a %match_results object. / ~match_results() { } //@} // 28.10.2, state: /* * @brief Indicates if the %match_results is ready. * @retval true The object has a fully-established result state. * @retval false The object is not ready. / bool ready() const { return !_Base_type::empty(); } /* * @name 28.10.2 Size / //@{ /* * @brief Gets the number of matches and submatches. * * The number of matches for a given regular expression will be either 0 * if there was no match or mark_count() + 1 if a match was successful. * Some matches may be empty. * * @returns the number of matches found. / size_type size() const { return _Base_type::empty() ? 0 : _Base_type::size() - 3; } size_type max_size() const { return _Base_type::max_size(); } /* * @brief Indicates if the %match_results contains no results. * @retval true The %match_results object is empty. * @retval false The %match_results object is not empty. / bool empty() const { return size() == 0; } //@} /* * @name 10.3 Element Access / //@{ /* * @brief Gets the length of the indicated submatch. * @param __sub indicates the submatch. * @pre ready() == true * * This function returns the length of the indicated submatch, or the * length of the entire match if @p __sub is zero (the default). / difference_type length(size_type __sub = 0) const { return (this)[__sub].length(); } /** * @brief Gets the offset of the beginning of the indicated submatch. * @param __sub indicates the submatch. * @pre ready() == true * * This function returns the offset from the beginning of the target * sequence to the beginning of the submatch, unless the value of @p __sub * is zero (the default), in which case this function returns the offset * from the beginning of the target sequence to the beginning of the * match. / difference_type position(size_type __sub = 0) const { return std::distance(_M_begin, (this)[__sub].first); } /** * @brief Gets the match or submatch converted to a string type. * @param __sub indicates the submatch. * @pre ready() == true * * This function gets the submatch (or match, if @p __sub is * zero) extracted from the target range and converted to the * associated string type. / string_type str(size_type __sub = 0) const { return string_type((this)[__sub]); } /** * @brief Gets a %sub_match reference for the match or submatch. * @param __sub indicates the submatch. * @pre ready() == true * * This function gets a reference to the indicated submatch, or * the entire match if @p __sub is zero. * * If @p __sub >= size() then this function returns a %sub_match with a * special value indicating no submatch. / const_reference operator[](size_type __sub) const { __glibcxx_assert( ready() ); return __sub < size() ? _Base_type::operator[](__sub) : _M_unmatched_sub(); } /* * @brief Gets a %sub_match representing the match prefix. * @pre ready() == true * * This function gets a reference to a %sub_match object representing the * part of the target range between the start of the target range and the * start of the match. / const_reference prefix() const { __glibcxx_assert( ready() ); return !empty() ? _M_prefix() : _M_unmatched_sub(); } /* * @brief Gets a %sub_match representing the match suffix. * @pre ready() == true * * This function gets a reference to a %sub_match object representing the * part of the target range between the end of the match and the end of * the target range. / const_reference suffix() const { __glibcxx_assert( ready() ); return !empty() ? _M_suffix() : _M_unmatched_sub(); } /* * @brief Gets an iterator to the start of the %sub_match collection. / const_iterator begin() const { return _Base_type::begin(); } /* * @brief Gets an iterator to the start of the %sub_match collection. / const_iterator cbegin() const { return this->begin(); } /* * @brief Gets an iterator to one-past-the-end of the collection. / const_iterator end() const { return _Base_type::end() - (empty() ? 0 : 3); } /* * @brief Gets an iterator to one-past-the-end of the collection. / const_iterator cend() const { return this->end(); } //@} /* * @name 10.4 Formatting * * These functions perform formatted substitution of the matched * character sequences into their target. The format specifiers and * escape sequences accepted by these functions are determined by * their @p flags parameter as documented above. / //@{ /* * @pre ready() == true / template<typename _Out_iter> _Out_iter format(_Out_iter __out, const char_type __fmt_first, const char_type* __fmt_last, match_flag_type __flags = regex_constants::format_default) const; /** * @pre ready() == true / template<typename _Out_iter, typename _St, typename _Sa> _Out_iter format(_Out_iter __out, const basic_string<char_type, _St, _Sa>& __fmt, match_flag_type __flags = regex_constants::format_default) const { return format(__out, __fmt.data(), __fmt.data() + __fmt.size(), __flags); } /* * @pre ready() == true / template<typename _St, typename _Sa> basic_string<char_type, _St, _Sa> format(const basic_string<char_type, _St, _Sa>& __fmt, match_flag_type __flags = regex_constants::format_default) const { basic_string<char_type, _St, _Sa> __result; format(std::back_inserter(__result), __fmt, __flags); return __result; } /* * @pre ready() == true / string_type format(const char_type __fmt, match_flag_type __flags = regex_constants::format_default) const { string_type __result; format(std::back_inserter(__result), __fmt, __fmt + char_traits<char_type>::length(__fmt), __flags); return __result; } //@} /** * @name 10.5 Allocator / //@{ /* * @brief Gets a copy of the allocator. / allocator_type get_allocator() const { return _Base_type::get_allocator(); } //@} /* * @name 10.6 Swap / //@{ /* * @brief Swaps the contents of two match_results. / void swap(match_results& __that) { using std::swap; _Base_type::swap(__that); swap(_M_begin, __that._M_begin); } //@} private: template<typename, typename, typename, bool> friend class __detail::_Executor; template<typename, typename, typename> friend class regex_iterator; template<typename _Bp, typename _Ap, typename _Cp, typename _Rp, __detail::_RegexExecutorPolicy, bool> friend bool __detail::__regex_algo_impl(_Bp, _Bp, match_results<_Bp, _Ap>&, const basic_regex<_Cp, _Rp>&, regex_constants::match_flag_type); void _M_resize(unsigned int __size) { _Base_type::resize(__size + 3); } const_reference _M_unmatched_sub() const { return _Base_type::operator[](_Base_type::size() - 3); } sub_match<_Bi_iter>& _M_unmatched_sub() { return _Base_type::operator[](_Base_type::size() - 3); } const_reference _M_prefix() const { return _Base_type::operator[](_Base_type::size() - 2); } sub_match<_Bi_iter>& _M_prefix() { return _Base_type::operator[](_Base_type::size() - 2); } const_reference _M_suffix() const { return _Base_type::operator[](_Base_type::size() - 1); } sub_match<_Bi_iter>& _M_suffix() { return _Base_type::operator[](_Base_type::size() - 1); } _Bi_iter _M_begin; }; typedef match_results<const char> cmatch; typedef match_results<string::const_iterator> smatch; #ifdef _GLIBCXX_USE_WCHAR_T typedef match_results<const wchar_t> wcmatch; typedef match_results<wstring::const_iterator> wsmatch; #endif // match_results comparisons /* * @brief Compares two match_results for equality. * @returns true if the two objects refer to the same match, * false otherwise. / template<typename _Bi_iter, typename _Alloc> inline bool operator==(const match_results<_Bi_iter, _Alloc>& __m1, const match_results<_Bi_iter, _Alloc>& __m2) { if (__m1.ready() != __m2.ready()) return false; if (!__m1.ready()) // both are not ready return true; if (__m1.empty() != __m2.empty()) return false; if (__m1.empty()) // both are empty return true; return __m1.prefix() == __m2.prefix() && __m1.size() == __m2.size() && std::equal(__m1.begin(), __m1.end(), __m2.begin()) && __m1.suffix() == __m2.suffix(); } /* * @brief Compares two match_results for inequality. * @returns true if the two objects do not refer to the same match, * false otherwise. / template<typename _Bi_iter, class _Alloc> inline bool operator!=(const match_results<_Bi_iter, _Alloc>& __m1, const match_results<_Bi_iter, _Alloc>& __m2) { return !(__m1 == __m2); } // [7.10.6] match_results swap /* * @brief Swaps two match results. * @param __lhs A match result. * @param __rhs A match result. * * The contents of the two match_results objects are swapped. / template<typename _Bi_iter, typename _Alloc> inline void swap(match_results<_Bi_iter, _Alloc>& __lhs, match_results<_Bi_iter, _Alloc>& __rhs) { __lhs.swap(__rhs); } _GLIBCXX_END_NAMESPACE_CXX11 // [7.11.2] Function template regex_match /* * @name Matching, Searching, and Replacing / //@{ /* * @brief Determines if there is a match between the regular expression @p e * and all of the character sequence [first, last). * * @param __s Start of the character sequence to match. * @param __e One-past-the-end of the character sequence to match. * @param __m The match results. * @param __re The regular expression. * @param __flags Controls how the regular expression is matched. * * @retval true A match exists. * @retval false Otherwise. * * @throws an exception of type regex_error. / template<typename _Bi_iter, typename _Alloc, typename _Ch_type, typename _Rx_traits> inline bool regex_match(_Bi_iter __s, _Bi_iter __e, match_results<_Bi_iter, _Alloc>& __m, const basic_regex<_Ch_type, _Rx_traits>& __re, regex_constants::match_flag_type __flags = regex_constants::match_default) { return __detail::__regex_algo_impl<_Bi_iter, _Alloc, _Ch_type, _Rx_traits, __detail::_RegexExecutorPolicy::_S_auto, true> (__s, __e, __m, __re, __flags); } /* * @brief Indicates if there is a match between the regular expression @p e * and all of the character sequence [first, last). * * @param __first Beginning of the character sequence to match. * @param __last One-past-the-end of the character sequence to match. * @param __re The regular expression. * @param __flags Controls how the regular expression is matched. * * @retval true A match exists. * @retval false Otherwise. * * @throws an exception of type regex_error. / template<typename _Bi_iter, typename _Ch_type, typename _Rx_traits> inline bool regex_match(_Bi_iter __first, _Bi_iter __last, const basic_regex<_Ch_type, _Rx_traits>& __re, regex_constants::match_flag_type __flags = regex_constants::match_default) { match_results<_Bi_iter> __what; return regex_match(__first, __last, __what, __re, __flags); } /* * @brief Determines if there is a match between the regular expression @p e * and a C-style null-terminated string. * * @param __s The C-style null-terminated string to match. * @param __m The match results. * @param __re The regular expression. * @param __f Controls how the regular expression is matched. * * @retval true A match exists. * @retval false Otherwise. * * @throws an exception of type regex_error. / template<typename _Ch_type, typename _Alloc, typename _Rx_traits> inline bool regex_match(const _Ch_type __s, match_results<const _Ch_type, _Alloc>& __m, const basic_regex<_Ch_type, _Rx_traits>& __re, regex_constants::match_flag_type __f = regex_constants::match_default) { return regex_match(__s, __s + _Rx_traits::length(__s), __m, __re, __f); } /* * @brief Determines if there is a match between the regular expression @p e * and a string. * * @param __s The string to match. * @param __m The match results. * @param __re The regular expression. * @param __flags Controls how the regular expression is matched. * * @retval true A match exists. * @retval false Otherwise. * * @throws an exception of type regex_error. / template<typename _Ch_traits, typename _Ch_alloc, typename _Alloc, typename _Ch_type, typename _Rx_traits> inline bool regex_match(const basic_string<_Ch_type, _Ch_traits, _Ch_alloc>& __s, match_results<typename basic_string<_Ch_type, _Ch_traits, _Ch_alloc>::const_iterator, _Alloc>& __m, const basic_regex<_Ch_type, _Rx_traits>& __re, regex_constants::match_flag_type __flags = regex_constants::match_default) { return regex_match(__s.begin(), __s.end(), __m, __re, __flags); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2329. regex_match() with match_results should forbid temporary strings /// Prevent unsafe attempts to get match_results from a temporary string. template<typename _Ch_traits, typename _Ch_alloc, typename _Alloc, typename _Ch_type, typename _Rx_traits> bool regex_match(const basic_string<_Ch_type, _Ch_traits, _Ch_alloc>&&, match_results<typename basic_string<_Ch_type, _Ch_traits, _Ch_alloc>::const_iterator, _Alloc>&, const basic_regex<_Ch_type, _Rx_traits>&, regex_constants::match_flag_type = regex_constants::match_default) = delete; /* * @brief Indicates if there is a match between the regular expression @p e * and a C-style null-terminated string. * * @param __s The C-style null-terminated string to match. * @param __re The regular expression. * @param __f Controls how the regular expression is matched. * * @retval true A match exists. * @retval false Otherwise. * * @throws an exception of type regex_error. / template<typename _Ch_type, class _Rx_traits> inline bool regex_match(const _Ch_type __s, const basic_regex<_Ch_type, _Rx_traits>& __re, regex_constants::match_flag_type __f = regex_constants::match_default) { return regex_match(__s, __s + _Rx_traits::length(__s), __re, __f); } /** * @brief Indicates if there is a match between the regular expression @p e * and a string. * * @param __s [IN] The string to match. * @param __re [IN] The regular expression. * @param __flags [IN] Controls how the regular expression is matched. * * @retval true A match exists. * @retval false Otherwise. * * @throws an exception of type regex_error. / template<typename _Ch_traits, typename _Str_allocator, typename _Ch_type, typename _Rx_traits> inline bool regex_match(const basic_string<_Ch_type, _Ch_traits, _Str_allocator>& __s, const basic_regex<_Ch_type, _Rx_traits>& __re, regex_constants::match_flag_type __flags = regex_constants::match_default) { return regex_match(__s.begin(), __s.end(), __re, __flags); } // [7.11.3] Function template regex_search /* * Searches for a regular expression within a range. * @param __s [IN] The start of the string to search. * @param __e [IN] One-past-the-end of the string to search. * @param __m [OUT] The match results. * @param __re [IN] The regular expression to search for. * @param __flags [IN] Search policy flags. * @retval true A match was found within the string. * @retval false No match was found within the string, the content of %m is * undefined. * * @throws an exception of type regex_error. / template<typename _Bi_iter, typename _Alloc, typename _Ch_type, typename _Rx_traits> inline bool regex_search(_Bi_iter __s, _Bi_iter __e, match_results<_Bi_iter, _Alloc>& __m, const basic_regex<_Ch_type, _Rx_traits>& __re, regex_constants::match_flag_type __flags = regex_constants::match_default) { return __detail::__regex_algo_impl<_Bi_iter, _Alloc, _Ch_type, _Rx_traits, __detail::_RegexExecutorPolicy::_S_auto, false> (__s, __e, __m, __re, __flags); } /* * Searches for a regular expression within a range. * @param __first [IN] The start of the string to search. * @param __last [IN] One-past-the-end of the string to search. * @param __re [IN] The regular expression to search for. * @param __flags [IN] Search policy flags. * @retval true A match was found within the string. * @retval false No match was found within the string. * * @throws an exception of type regex_error. / template<typename _Bi_iter, typename _Ch_type, typename _Rx_traits> inline bool regex_search(_Bi_iter __first, _Bi_iter __last, const basic_regex<_Ch_type, _Rx_traits>& __re, regex_constants::match_flag_type __flags = regex_constants::match_default) { match_results<_Bi_iter> __what; return regex_search(__first, __last, __what, __re, __flags); } /* * @brief Searches for a regular expression within a C-string. * @param __s [IN] A C-string to search for the regex. * @param __m [OUT] The set of regex matches. * @param __e [IN] The regex to search for in @p s. * @param __f [IN] The search flags. * @retval true A match was found within the string. * @retval false No match was found within the string, the content of %m is * undefined. * * @throws an exception of type regex_error. / template<typename _Ch_type, class _Alloc, class _Rx_traits> inline bool regex_search(const _Ch_type __s, match_results<const _Ch_type, _Alloc>& __m, const basic_regex<_Ch_type, _Rx_traits>& __e, regex_constants::match_flag_type __f = regex_constants::match_default) { return regex_search(__s, __s + _Rx_traits::length(__s), __m, __e, __f); } /* * @brief Searches for a regular expression within a C-string. * @param __s [IN] The C-string to search. * @param __e [IN] The regular expression to search for. * @param __f [IN] Search policy flags. * @retval true A match was found within the string. * @retval false No match was found within the string. * * @throws an exception of type regex_error. / template<typename _Ch_type, typename _Rx_traits> inline bool regex_search(const _Ch_type __s, const basic_regex<_Ch_type, _Rx_traits>& __e, regex_constants::match_flag_type __f = regex_constants::match_default) { return regex_search(__s, __s + _Rx_traits::length(__s), __e, __f); } /** * @brief Searches for a regular expression within a string. * @param __s [IN] The string to search. * @param __e [IN] The regular expression to search for. * @param __flags [IN] Search policy flags. * @retval true A match was found within the string. * @retval false No match was found within the string. * * @throws an exception of type regex_error. / template<typename _Ch_traits, typename _String_allocator, typename _Ch_type, typename _Rx_traits> inline bool regex_search(const basic_string<_Ch_type, _Ch_traits, _String_allocator>& __s, const basic_regex<_Ch_type, _Rx_traits>& __e, regex_constants::match_flag_type __flags = regex_constants::match_default) { return regex_search(__s.begin(), __s.end(), __e, __flags); } /* * @brief Searches for a regular expression within a string. * @param __s [IN] A C++ string to search for the regex. * @param __m [OUT] The set of regex matches. * @param __e [IN] The regex to search for in @p s. * @param __f [IN] The search flags. * @retval true A match was found within the string. * @retval false No match was found within the string, the content of %m is * undefined. * * @throws an exception of type regex_error. / template<typename _Ch_traits, typename _Ch_alloc, typename _Alloc, typename _Ch_type, typename _Rx_traits> inline bool regex_search(const basic_string<_Ch_type, _Ch_traits, _Ch_alloc>& __s, match_results<typename basic_string<_Ch_type, _Ch_traits, _Ch_alloc>::const_iterator, _Alloc>& __m, const basic_regex<_Ch_type, _Rx_traits>& __e, regex_constants::match_flag_type __f = regex_constants::match_default) { return regex_search(__s.begin(), __s.end(), __m, __e, __f); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2329. regex_search() with match_results should forbid temporary strings /// Prevent unsafe attempts to get match_results from a temporary string. template<typename _Ch_traits, typename _Ch_alloc, typename _Alloc, typename _Ch_type, typename _Rx_traits> bool regex_search(const basic_string<_Ch_type, _Ch_traits, _Ch_alloc>&&, match_results<typename basic_string<_Ch_type, _Ch_traits, _Ch_alloc>::const_iterator, _Alloc>&, const basic_regex<_Ch_type, _Rx_traits>&, regex_constants::match_flag_type = regex_constants::match_default) = delete; // std [28.11.4] Function template regex_replace /* * @brief Search for a regular expression within a range for multiple times, and replace the matched parts through filling a format string. * @param __out [OUT] The output iterator. * @param __first [IN] The start of the string to search. * @param __last [IN] One-past-the-end of the string to search. * @param __e [IN] The regular expression to search for. * @param __fmt [IN] The format string. * @param __flags [IN] Search and replace policy flags. * * @returns __out * @throws an exception of type regex_error. / template<typename _Out_iter, typename _Bi_iter, typename _Rx_traits, typename _Ch_type, typename _St, typename _Sa> inline _Out_iter regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last, const basic_regex<_Ch_type, _Rx_traits>& __e, const basic_string<_Ch_type, _St, _Sa>& __fmt, regex_constants::match_flag_type __flags = regex_constants::match_default) { return regex_replace(__out, __first, __last, __e, __fmt.c_str(), __flags); } /* * @brief Search for a regular expression within a range for multiple times, and replace the matched parts through filling a format C-string. * @param __out [OUT] The output iterator. * @param __first [IN] The start of the string to search. * @param __last [IN] One-past-the-end of the string to search. * @param __e [IN] The regular expression to search for. * @param __fmt [IN] The format C-string. * @param __flags [IN] Search and replace policy flags. * * @returns __out * @throws an exception of type regex_error. / template<typename _Out_iter, typename _Bi_iter, typename _Rx_traits, typename _Ch_type> _Out_iter regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last, const basic_regex<_Ch_type, _Rx_traits>& __e, const _Ch_type __fmt, regex_constants::match_flag_type __flags = regex_constants::match_default); /** * @brief Search for a regular expression within a string for multiple times, and replace the matched parts through filling a format string. * @param __s [IN] The string to search and replace. * @param __e [IN] The regular expression to search for. * @param __fmt [IN] The format string. * @param __flags [IN] Search and replace policy flags. * * @returns The string after replacing. * @throws an exception of type regex_error. / template<typename _Rx_traits, typename _Ch_type, typename _St, typename _Sa, typename _Fst, typename _Fsa> inline basic_string<_Ch_type, _St, _Sa> regex_replace(const basic_string<_Ch_type, _St, _Sa>& __s, const basic_regex<_Ch_type, _Rx_traits>& __e, const basic_string<_Ch_type, _Fst, _Fsa>& __fmt, regex_constants::match_flag_type __flags = regex_constants::match_default) { basic_string<_Ch_type, _St, _Sa> __result; regex_replace(std::back_inserter(__result), __s.begin(), __s.end(), __e, __fmt, __flags); return __result; } /* * @brief Search for a regular expression within a string for multiple times, and replace the matched parts through filling a format C-string. * @param __s [IN] The string to search and replace. * @param __e [IN] The regular expression to search for. * @param __fmt [IN] The format C-string. * @param __flags [IN] Search and replace policy flags. * * @returns The string after replacing. * @throws an exception of type regex_error. / template<typename _Rx_traits, typename _Ch_type, typename _St, typename _Sa> inline basic_string<_Ch_type, _St, _Sa> regex_replace(const basic_string<_Ch_type, _St, _Sa>& __s, const basic_regex<_Ch_type, _Rx_traits>& __e, const _Ch_type __fmt, regex_constants::match_flag_type __flags = regex_constants::match_default) { basic_string<_Ch_type, _St, _Sa> __result; regex_replace(std::back_inserter(__result), __s.begin(), __s.end(), __e, __fmt, __flags); return __result; } /** * @brief Search for a regular expression within a C-string for multiple times, and replace the matched parts through filling a format string. * @param __s [IN] The C-string to search and replace. * @param __e [IN] The regular expression to search for. * @param __fmt [IN] The format string. * @param __flags [IN] Search and replace policy flags. * * @returns The string after replacing. * @throws an exception of type regex_error. / template<typename _Rx_traits, typename _Ch_type, typename _St, typename _Sa> inline basic_string<_Ch_type> regex_replace(const _Ch_type __s, const basic_regex<_Ch_type, _Rx_traits>& __e, const basic_string<_Ch_type, _St, _Sa>& __fmt, regex_constants::match_flag_type __flags = regex_constants::match_default) { basic_string<_Ch_type> __result; regex_replace(std::back_inserter(__result), __s, __s + char_traits<_Ch_type>::length(__s), __e, __fmt, __flags); return __result; } /** * @brief Search for a regular expression within a C-string for multiple times, and replace the matched parts through filling a format C-string. * @param __s [IN] The C-string to search and replace. * @param __e [IN] The regular expression to search for. * @param __fmt [IN] The format C-string. * @param __flags [IN] Search and replace policy flags. * * @returns The string after replacing. * @throws an exception of type regex_error. / template<typename _Rx_traits, typename _Ch_type> inline basic_string<_Ch_type> regex_replace(const _Ch_type __s, const basic_regex<_Ch_type, _Rx_traits>& __e, const _Ch_type* __fmt, regex_constants::match_flag_type __flags = regex_constants::match_default) { basic_string<_Ch_type> __result; regex_replace(std::back_inserter(__result), __s, __s + char_traits<_Ch_type>::length(__s), __e, __fmt, __flags); return __result; } //@} _GLIBCXX_BEGIN_NAMESPACE_CXX11 // std [28.12] Class template regex_iterator /** * An iterator adaptor that will provide repeated calls of regex_search over * a range until no more matches remain. / template<typename _Bi_iter, typename _Ch_type = typename iterator_traits<_Bi_iter>::value_type, typename _Rx_traits = regex_traits<_Ch_type> > class regex_iterator { public: typedef basic_regex<_Ch_type, _Rx_traits> regex_type; typedef match_results<_Bi_iter> value_type; typedef std::ptrdiff_t difference_type; typedef const value_type pointer; typedef const value_type& reference; typedef std::forward_iterator_tag iterator_category; /** * @brief Provides a singular iterator, useful for indicating * one-past-the-end of a range. / regex_iterator() : _M_pregex() { } /* * Constructs a %regex_iterator... * @param __a [IN] The start of a text range to search. * @param __b [IN] One-past-the-end of the text range to search. * @param __re [IN] The regular expression to match. * @param __m [IN] Policy flags for match rules. / regex_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re, regex_constants::match_flag_type __m = regex_constants::match_default) : _M_begin(__a), _M_end(__b), _M_pregex(&__re), _M_flags(__m), _M_match() { if (!regex_search(_M_begin, _M_end, _M_match, _M_pregex, _M_flags)) this = regex_iterator(); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2332. regex_iterator should forbid temporary regexes regex_iterator(_Bi_iter, _Bi_iter, const regex_type&&, regex_constants::match_flag_type = regex_constants::match_default) = delete; /* * Copy constructs a %regex_iterator. / regex_iterator(const regex_iterator& __rhs) = default; /* * @brief Assigns one %regex_iterator to another. / regex_iterator& operator=(const regex_iterator& __rhs) = default; /* * @brief Tests the equivalence of two regex iterators. / bool operator==(const regex_iterator& __rhs) const; /* * @brief Tests the inequivalence of two regex iterators. / bool operator!=(const regex_iterator& __rhs) const { return !(this == __rhs); } /** * @brief Dereferences a %regex_iterator. / const value_type& operator() const { return _M_match; } /** * @brief Selects a %regex_iterator member. / const value_type operator->() const { return &_M_match; } /** * @brief Increments a %regex_iterator. / regex_iterator& operator++(); /* * @brief Postincrements a %regex_iterator. / regex_iterator operator++(int) { auto __tmp = this; ++(this); return __tmp; } private: _Bi_iter _M_begin; _Bi_iter _M_end; const regex_type _M_pregex; regex_constants::match_flag_type _M_flags; match_results<_Bi_iter> _M_match; }; typedef regex_iterator<const char> cregex_iterator; typedef regex_iterator<string::const_iterator> sregex_iterator; #ifdef _GLIBCXX_USE_WCHAR_T typedef regex_iterator<const wchar_t> wcregex_iterator; typedef regex_iterator<wstring::const_iterator> wsregex_iterator; #endif // [7.12.2] Class template regex_token_iterator /** * Iterates over submatches in a range (or @a splits a text string). * * The purpose of this iterator is to enumerate all, or all specified, * matches of a regular expression within a text range. The dereferenced * value of an iterator of this class is a std::sub_match object. / template<typename _Bi_iter, typename _Ch_type = typename iterator_traits<_Bi_iter>::value_type, typename _Rx_traits = regex_traits<_Ch_type> > class regex_token_iterator { public: typedef basic_regex<_Ch_type, _Rx_traits> regex_type; typedef sub_match<_Bi_iter> value_type; typedef std::ptrdiff_t difference_type; typedef const value_type pointer; typedef const value_type& reference; typedef std::forward_iterator_tag iterator_category; public: /** * @brief Default constructs a %regex_token_iterator. * * A default-constructed %regex_token_iterator is a singular iterator * that will compare equal to the one-past-the-end value for any * iterator of the same type. / regex_token_iterator() : _M_position(), _M_subs(), _M_suffix(), _M_n(0), _M_result(nullptr), _M_has_m1(false) { } /* * Constructs a %regex_token_iterator... * @param __a [IN] The start of the text to search. * @param __b [IN] One-past-the-end of the text to search. * @param __re [IN] The regular expression to search for. * @param __submatch [IN] Which submatch to return. There are some * special values for this parameter: * - -1 each enumerated subexpression does NOT * match the regular expression (aka field * splitting) * - 0 the entire string matching the * subexpression is returned for each match * within the text. * - >0 enumerates only the indicated * subexpression from a match within the text. * @param __m [IN] Policy flags for match rules. / regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re, int __submatch = 0, regex_constants::match_flag_type __m = regex_constants::match_default) : _M_position(__a, __b, __re, __m), _M_subs(1, __submatch), _M_n(0) { _M_init(__a, __b); } /* * Constructs a %regex_token_iterator... * @param __a [IN] The start of the text to search. * @param __b [IN] One-past-the-end of the text to search. * @param __re [IN] The regular expression to search for. * @param __submatches [IN] A list of subexpressions to return for each * regular expression match within the text. * @param __m [IN] Policy flags for match rules. / regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re, const std::vector<int>& __submatches, regex_constants::match_flag_type __m = regex_constants::match_default) : _M_position(__a, __b, __re, __m), _M_subs(__submatches), _M_n(0) { _M_init(__a, __b); } /* * Constructs a %regex_token_iterator... * @param __a [IN] The start of the text to search. * @param __b [IN] One-past-the-end of the text to search. * @param __re [IN] The regular expression to search for. * @param __submatches [IN] A list of subexpressions to return for each * regular expression match within the text. * @param __m [IN] Policy flags for match rules. / regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re, initializer_list<int> __submatches, regex_constants::match_flag_type __m = regex_constants::match_default) : _M_position(__a, __b, __re, __m), _M_subs(__submatches), _M_n(0) { _M_init(__a, __b); } /* * Constructs a %regex_token_iterator... * @param __a [IN] The start of the text to search. * @param __b [IN] One-past-the-end of the text to search. * @param __re [IN] The regular expression to search for. * @param __submatches [IN] A list of subexpressions to return for each * regular expression match within the text. * @param __m [IN] Policy flags for match rules. / template<std::size_t _Nm> regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re, const int (&__submatches)[_Nm], regex_constants::match_flag_type __m = regex_constants::match_default) : _M_position(__a, __b, __re, __m), _M_subs(__submatches, __submatches + _Nm), _M_n(0) { _M_init(__a, __b); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2332. regex_token_iterator should forbid temporary regexes regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&, int = 0, regex_constants::match_flag_type = regex_constants::match_default) = delete; regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&, const std::vector<int>&, regex_constants::match_flag_type = regex_constants::match_default) = delete; regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&, initializer_list<int>, regex_constants::match_flag_type = regex_constants::match_default) = delete; template <std::size_t _Nm> regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&, const int (&)[_Nm], regex_constants::match_flag_type = regex_constants::match_default) = delete; /* * @brief Copy constructs a %regex_token_iterator. * @param __rhs [IN] A %regex_token_iterator to copy. / regex_token_iterator(const regex_token_iterator& __rhs) : _M_position(__rhs._M_position), _M_subs(__rhs._M_subs), _M_suffix(__rhs._M_suffix), _M_n(__rhs._M_n), _M_has_m1(__rhs._M_has_m1) { _M_normalize_result(); } /* * @brief Assigns a %regex_token_iterator to another. * @param __rhs [IN] A %regex_token_iterator to copy. / regex_token_iterator& operator=(const regex_token_iterator& __rhs); /* * @brief Compares a %regex_token_iterator to another for equality. / bool operator==(const regex_token_iterator& __rhs) const; /* * @brief Compares a %regex_token_iterator to another for inequality. / bool operator!=(const regex_token_iterator& __rhs) const { return !(this == __rhs); } /** * @brief Dereferences a %regex_token_iterator. / const value_type& operator() const { return _M_result; } /* * @brief Selects a %regex_token_iterator member. / const value_type operator->() const { return _M_result; } /** * @brief Increments a %regex_token_iterator. / regex_token_iterator& operator++(); /* * @brief Postincrements a %regex_token_iterator. / regex_token_iterator operator++(int) { auto __tmp = this; ++(this); return __tmp; } private: typedef regex_iterator<_Bi_iter, _Ch_type, _Rx_traits> _Position; void _M_init(_Bi_iter __a, _Bi_iter __b); const value_type& _M_current_match() const { if (_M_subs[_M_n] == -1) return (_M_position).prefix(); else return (_M_position)[_M_subs[_M_n]]; } constexpr bool _M_end_of_seq() const { return _M_result == nullptr; } // [28.12.2.2.4] void _M_normalize_result() { if (_M_position != _Position()) _M_result = &_M_current_match(); else if (_M_has_m1) _M_result = &_M_suffix; else _M_result = nullptr; } _Position _M_position; std::vector<int> _M_subs; value_type _M_suffix; std::size_t _M_n; const value_type _M_result; // Show whether _M_subs contains -1 bool _M_has_m1; }; /** @brief Token iterator for C-style NULL-terminated strings. / typedef regex_token_iterator<const char> cregex_token_iterator; /** @brief Token iterator for standard strings. / typedef regex_token_iterator<string::const_iterator> sregex_token_iterator; #ifdef _GLIBCXX_USE_WCHAR_T /* @brief Token iterator for C-style NULL-terminated wide strings. / typedef regex_token_iterator<const wchar_t> wcregex_token_iterator; /** @brief Token iterator for standard wide-character strings. */ typedef regex_token_iterator<wstring::const_iterator> wsregex_token_iterator; #endif //@} // group regex _GLIBCXX_END_NAMESPACE_CXX11 _GLIBCXX_END_NAMESPACE_VERSION } // namespace #include <bits/regex.tcc> Back

Edit File : regex.h | Size : 95.12 KB

// class template regex -*- C++ -*-

// Copyright (C) 2010-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/**
 *  @file bits/regex.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{regex}
 */

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
_GLIBCXX_BEGIN_NAMESPACE_CXX11
  template<typename, typename>
    class basic_regex;

template<typename, typename>
    class match_results;

_GLIBCXX_END_NAMESPACE_CXX11

namespace __detail
{
  enum class _RegexExecutorPolicy : int
    { _S_auto, _S_alternate };

template<typename _BiIter, typename _Alloc,
	   typename _CharT, typename _TraitsT,
	   _RegexExecutorPolicy __policy,
	   bool __match_mode>
    bool
    __regex_algo_impl(_BiIter			      __s,
		      _BiIter			      __e,
		      match_results<_BiIter, _Alloc>&      __m,
		      const basic_regex<_CharT, _TraitsT>& __re,
		      regex_constants::match_flag_type     __flags);

template<typename, typename, typename, bool>
    class _Executor;
}

_GLIBCXX_BEGIN_NAMESPACE_CXX11

/**
   * @addtogroup regex
   * @{
   */

/**
   * @brief Describes aspects of a regular expression.
   *
   * A regular expression traits class that satisfies the requirements of
   * section [28.7].
   *
   * The class %regex is parameterized around a set of related types and
   * functions used to complete the definition of its semantics.  This class
   * satisfies the requirements of such a traits class.
   */
  template<typename _Ch_type>
    struct regex_traits
    {
    public:
      typedef _Ch_type				char_type;
      typedef std::basic_string<char_type>	string_type;
      typedef std::locale			locale_type;
    private:
      struct _RegexMask
	{
	  typedef std::ctype_base::mask _BaseType;
	  _BaseType _M_base;
	  unsigned char _M_extended;
	  static constexpr unsigned char _S_under = 1 << 0;
	  static constexpr unsigned char _S_valid_mask = 0x1;

constexpr _RegexMask(_BaseType __base = 0,
			       unsigned char __extended = 0)
	  : _M_base(__base), _M_extended(__extended)
	  { }

constexpr _RegexMask
	  operator&(_RegexMask __other) const
	  {
	    return _RegexMask(_M_base & __other._M_base,
			      _M_extended & __other._M_extended);
	  }

constexpr _RegexMask
	  operator|(_RegexMask __other) const
	  {
	    return _RegexMask(_M_base | __other._M_base,
			      _M_extended | __other._M_extended);
	  }

constexpr _RegexMask
	  operator^(_RegexMask __other) const
	  {
	    return _RegexMask(_M_base ^ __other._M_base,
			      _M_extended ^ __other._M_extended);
	  }

constexpr _RegexMask
	  operator~() const
	  { return _RegexMask(~_M_base, ~_M_extended); }

_RegexMask&
	  operator&=(_RegexMask __other)
	  { return *this = (*this) & __other; }

_RegexMask&
	  operator|=(_RegexMask __other)
	  { return *this = (*this) | __other; }

_RegexMask&
	  operator^=(_RegexMask __other)
	  { return *this = (*this) ^ __other; }

constexpr bool
	  operator==(_RegexMask __other) const
	  {
	    return (_M_extended & _S_valid_mask)
		   == (__other._M_extended & _S_valid_mask)
		     && _M_base == __other._M_base;
	  }

constexpr bool
	  operator!=(_RegexMask __other) const
	  { return !((*this) == __other); }

};
    public:
      typedef _RegexMask char_class_type;

public:
      /**
       * @brief Constructs a default traits object.
       */
      regex_traits() { }

/**
       * @brief Gives the length of a C-style string starting at @p __p.
       *
       * @param __p a pointer to the start of a character sequence.
       *
       * @returns the number of characters between @p *__p and the first
       * default-initialized value of type @p char_type.  In other words, uses
       * the C-string algorithm for determining the length of a sequence of
       * characters.
       */
      static std::size_t
      length(const char_type* __p)
      { return string_type::traits_type::length(__p); }

/**
       * @brief Performs the identity translation.
       *
       * @param __c A character to the locale-specific character set.
       *
       * @returns __c.
       */
      char_type
      translate(char_type __c) const
      { return __c; }

/**
       * @brief Translates a character into a case-insensitive equivalent.
       *
       * @param __c A character to the locale-specific character set.
       *
       * @returns the locale-specific lower-case equivalent of __c.
       * @throws std::bad_cast if the imbued locale does not support the ctype
       *         facet.
       */
      char_type
      translate_nocase(char_type __c) const
      {
	typedef std::ctype<char_type> __ctype_type;
	const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
	return __fctyp.tolower(__c);
      }

/**
       * @brief Gets a sort key for a character sequence.
       *
       * @param __first beginning of the character sequence.
       * @param __last  one-past-the-end of the character sequence.
       *
       * Returns a sort key for the character sequence designated by the
       * iterator range [F1, F2) such that if the character sequence [G1, G2)
       * sorts before the character sequence [H1, H2) then
       * v.transform(G1, G2) < v.transform(H1, H2).
       *
       * What this really does is provide a more efficient way to compare a
       * string to multiple other strings in locales with fancy collation
       * rules and equivalence classes.
       *
       * @returns a locale-specific sort key equivalent to the input range.
       *
       * @throws std::bad_cast if the current locale does not have a collate
       *         facet.
       */
      template<typename _Fwd_iter>
	string_type
	transform(_Fwd_iter __first, _Fwd_iter __last) const
	{
	  typedef std::collate<char_type> __collate_type;
	  const __collate_type& __fclt(use_facet<__collate_type>(_M_locale));
	  string_type __s(__first, __last);
	  return __fclt.transform(__s.data(), __s.data() + __s.size());
	}

/**
       * @brief Gets a sort key for a character sequence, independent of case.
       *
       * @param __first beginning of the character sequence.
       * @param __last  one-past-the-end of the character sequence.
       *
       * Effects: if typeid(use_facet<collate<_Ch_type> >) ==
       * typeid(collate_byname<_Ch_type>) and the form of the sort key
       * returned by collate_byname<_Ch_type>::transform(__first, __last)
       * is known and can be converted into a primary sort key
       * then returns that key, otherwise returns an empty string.
       *
       * @todo Implement this function correctly.
       */
      template<typename _Fwd_iter>
	string_type
	transform_primary(_Fwd_iter __first, _Fwd_iter __last) const
	{
	  // TODO : this is not entirely correct.
	  // This function requires extra support from the platform.
	  //
	  // Read http://gcc.gnu.org/ml/libstdc++/2013-09/msg00117.html and
	  // http://www.open-std.org/Jtc1/sc22/wg21/docs/papers/2003/n1429.htm
	  // for details.
	  typedef std::ctype<char_type> __ctype_type;
	  const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
	  std::vector<char_type> __s(__first, __last);
	  __fctyp.tolower(__s.data(), __s.data() + __s.size());
	  return this->transform(__s.data(), __s.data() + __s.size());
	}

/**
       * @brief Gets a collation element by name.
       *
       * @param __first beginning of the collation element name.
       * @param __last  one-past-the-end of the collation element name.
       *
       * @returns a sequence of one or more characters that represents the
       * collating element consisting of the character sequence designated by
       * the iterator range [__first, __last). Returns an empty string if the
       * character sequence is not a valid collating element.
       */
      template<typename _Fwd_iter>
	string_type
	lookup_collatename(_Fwd_iter __first, _Fwd_iter __last) const;

/**
       * @brief Maps one or more characters to a named character
       *        classification.
       *
       * @param __first beginning of the character sequence.
       * @param __last  one-past-the-end of the character sequence.
       * @param __icase ignores the case of the classification name.
       *
       * @returns an unspecified value that represents the character
       * classification named by the character sequence designated by
       * the iterator range [__first, __last). If @p icase is true,
       * the returned mask identifies the classification regardless of
       * the case of the characters to be matched (for example,
       * [[:lower:]] is the same as [[:alpha:]]), otherwise a
       * case-dependent classification is returned.  The value
       * returned shall be independent of the case of the characters
       * in the character sequence. If the name is not recognized then
       * returns a value that compares equal to 0.
       *
       * At least the following names (or their wide-character equivalent) are
       * supported.
       * - d
       * - w
       * - s
       * - alnum
       * - alpha
       * - blank
       * - cntrl
       * - digit
       * - graph
       * - lower
       * - print
       * - punct
       * - space
       * - upper
       * - xdigit
       */
      template<typename _Fwd_iter>
	char_class_type
	lookup_classname(_Fwd_iter __first, _Fwd_iter __last,
			 bool __icase = false) const;

/**
       * @brief Determines if @p c is a member of an identified class.
       *
       * @param __c a character.
       * @param __f a class type (as returned from lookup_classname).
       *
       * @returns true if the character @p __c is a member of the classification
       * represented by @p __f, false otherwise.
       *
       * @throws std::bad_cast if the current locale does not have a ctype
       *         facet.
       */
      bool
      isctype(_Ch_type __c, char_class_type __f) const;

/**
       * @brief Converts a digit to an int.
       *
       * @param __ch    a character representing a digit.
       * @param __radix the radix if the numeric conversion (limited to 8, 10,
       *              or 16).
       *
       * @returns the value represented by the digit __ch in base radix if the
       * character __ch is a valid digit in base radix; otherwise returns -1.
       */
      int
      value(_Ch_type __ch, int __radix) const;

/**
       * @brief Imbues the regex_traits object with a copy of a new locale.
       *
       * @param __loc A locale.
       *
       * @returns a copy of the previous locale in use by the regex_traits
       *          object.
       *
       * @note Calling imbue with a different locale than the one currently in
       *       use invalidates all cached data held by *this.
       */
      locale_type
      imbue(locale_type __loc)
      {
	std::swap(_M_locale, __loc);
	return __loc;
      }

/**
       * @brief Gets a copy of the current locale in use by the regex_traits
       * object.
       */
      locale_type
      getloc() const
      { return _M_locale; }

protected:
      locale_type _M_locale;
    };

// [7.8] Class basic_regex
  /**
   * Objects of specializations of this class represent regular expressions
   * constructed from sequences of character type @p _Ch_type.
   *
   * Storage for the regular expression is allocated and deallocated as
   * necessary by the member functions of this class.
   */
  template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>>
    class basic_regex
    {
    public:
      static_assert(is_same<_Ch_type, typename _Rx_traits::char_type>::value,
		    "regex traits class must have the same char_type");

// types:
      typedef _Ch_type				  value_type;
      typedef _Rx_traits			  traits_type;
      typedef typename traits_type::string_type   string_type;
      typedef regex_constants::syntax_option_type flag_type;
      typedef typename traits_type::locale_type   locale_type;

/**
       * @name Constants
       * std [28.8.1](1)
       */
      //@{
      static constexpr flag_type icase = regex_constants::icase;
      static constexpr flag_type nosubs = regex_constants::nosubs;
      static constexpr flag_type optimize = regex_constants::optimize;
      static constexpr flag_type collate = regex_constants::collate;
      static constexpr flag_type ECMAScript = regex_constants::ECMAScript;
      static constexpr flag_type basic = regex_constants::basic;
      static constexpr flag_type extended = regex_constants::extended;
      static constexpr flag_type awk = regex_constants::awk;
      static constexpr flag_type grep = regex_constants::grep;
      static constexpr flag_type egrep = regex_constants::egrep;
      //@}

// [7.8.2] construct/copy/destroy
      /**
       * Constructs a basic regular expression that does not match any
       * character sequence.
       */
      basic_regex()
      : _M_flags(ECMAScript), _M_loc(), _M_automaton(nullptr)
      { }

/**
       * @brief Constructs a basic regular expression from the
       * sequence [__p, __p + char_traits<_Ch_type>::length(__p))
       * interpreted according to the flags in @p __f.
       *
       * @param __p A pointer to the start of a C-style null-terminated string
       *          containing a regular expression.
       * @param __f Flags indicating the syntax rules and options.
       *
       * @throws regex_error if @p __p is not a valid regular expression.
       */
      explicit
      basic_regex(const _Ch_type* __p, flag_type __f = ECMAScript)
      : basic_regex(__p, __p + char_traits<_Ch_type>::length(__p), __f)
      { }

/**
       * @brief Constructs a basic regular expression from the sequence
       * [p, p + len) interpreted according to the flags in @p f.
       *
       * @param __p   A pointer to the start of a string containing a regular
       *              expression.
       * @param __len The length of the string containing the regular
       *              expression.
       * @param __f   Flags indicating the syntax rules and options.
       *
       * @throws regex_error if @p __p is not a valid regular expression.
       */
      basic_regex(const _Ch_type* __p, std::size_t __len,
		  flag_type __f = ECMAScript)
      : basic_regex(__p, __p + __len, __f)
      { }

/**
       * @brief Copy-constructs a basic regular expression.
       *
       * @param __rhs A @p regex object.
       */
      basic_regex(const basic_regex& __rhs) = default;

/**
       * @brief Move-constructs a basic regular expression.
       *
       * @param __rhs A @p regex object.
       */
      basic_regex(basic_regex&& __rhs) noexcept = default;

/**
       * @brief Constructs a basic regular expression from the string
       * @p s interpreted according to the flags in @p f.
       *
       * @param __s A string containing a regular expression.
       * @param __f Flags indicating the syntax rules and options.
       *
       * @throws regex_error if @p __s is not a valid regular expression.
       */
      template<typename _Ch_traits, typename _Ch_alloc>
	explicit
	basic_regex(const std::basic_string<_Ch_type, _Ch_traits,
					    _Ch_alloc>& __s,
		    flag_type __f = ECMAScript)
	: basic_regex(__s.data(), __s.data() + __s.size(), __f)
	{ }

/**
       * @brief Constructs a basic regular expression from the range
       * [first, last) interpreted according to the flags in @p f.
       *
       * @param __first The start of a range containing a valid regular
       *                expression.
       * @param __last  The end of a range containing a valid regular
       *                expression.
       * @param __f     The format flags of the regular expression.
       *
       * @throws regex_error if @p [__first, __last) is not a valid regular
       *         expression.
       */
      template<typename _FwdIter>
	basic_regex(_FwdIter __first, _FwdIter __last,
		    flag_type __f = ECMAScript)
	: basic_regex(std::move(__first), std::move(__last), locale_type(), __f)
	{ }

/**
       * @brief Constructs a basic regular expression from an initializer list.
       *
       * @param __l  The initializer list.
       * @param __f  The format flags of the regular expression.
       *
       * @throws regex_error if @p __l is not a valid regular expression.
       */
      basic_regex(initializer_list<_Ch_type> __l, flag_type __f = ECMAScript)
      : basic_regex(__l.begin(), __l.end(), __f)
      { }

/**
       * @brief Destroys a basic regular expression.
       */
      ~basic_regex()
      { }

/**
       * @brief Assigns one regular expression to another.
       */
      basic_regex&
      operator=(const basic_regex& __rhs)
      { return this->assign(__rhs); }

/**
       * @brief Move-assigns one regular expression to another.
       */
      basic_regex&
      operator=(basic_regex&& __rhs) noexcept
      { return this->assign(std::move(__rhs)); }

/**
       * @brief Replaces a regular expression with a new one constructed from
       * a C-style null-terminated string.
       *
       * @param __p A pointer to the start of a null-terminated C-style string
       *        containing a regular expression.
       */
      basic_regex&
      operator=(const _Ch_type* __p)
      { return this->assign(__p); }

/**
       * @brief Replaces a regular expression with a new one constructed from
       * an initializer list.
       *
       * @param __l  The initializer list.
       *
       * @throws regex_error if @p __l is not a valid regular expression.
       */
      basic_regex&
      operator=(initializer_list<_Ch_type> __l)
      { return this->assign(__l.begin(), __l.end()); }

/**
       * @brief Replaces a regular expression with a new one constructed from
       * a string.
       *
       * @param __s A pointer to a string containing a regular expression.
       */
      template<typename _Ch_traits, typename _Alloc>
	basic_regex&
	operator=(const basic_string<_Ch_type, _Ch_traits, _Alloc>& __s)
	{ return this->assign(__s); }

// [7.8.3] assign
      /**
       * @brief the real assignment operator.
       *
       * @param __rhs Another regular expression object.
       */
      basic_regex&
      assign(const basic_regex& __rhs)
      {
	basic_regex __tmp(__rhs);
	this->swap(__tmp);
	return *this;
      }

/**
       * @brief The move-assignment operator.
       *
       * @param __rhs Another regular expression object.
       */
      basic_regex&
      assign(basic_regex&& __rhs) noexcept
      {
	basic_regex __tmp(std::move(__rhs));
	this->swap(__tmp);
	return *this;
      }

/**
       * @brief Assigns a new regular expression to a regex object from a
       * C-style null-terminated string containing a regular expression
       * pattern.
       *
       * @param __p     A pointer to a C-style null-terminated string containing
       *              a regular expression pattern.
       * @param __flags Syntax option flags.
       *
       * @throws regex_error if __p does not contain a valid regular
       * expression pattern interpreted according to @p __flags.  If
       * regex_error is thrown, *this remains unchanged.
       */
      basic_regex&
      assign(const _Ch_type* __p, flag_type __flags = ECMAScript)
      { return this->assign(string_type(__p), __flags); }

/**
       * @brief Assigns a new regular expression to a regex object from a
       * C-style string containing a regular expression pattern.
       *
       * @param __p     A pointer to a C-style string containing a
       *                regular expression pattern.
       * @param __len   The length of the regular expression pattern string.
       * @param __flags Syntax option flags.
       *
       * @throws regex_error if p does not contain a valid regular
       * expression pattern interpreted according to @p __flags.  If
       * regex_error is thrown, *this remains unchanged.
       */
      basic_regex&
      assign(const _Ch_type* __p, std::size_t __len, flag_type __flags)
      { return this->assign(string_type(__p, __len), __flags); }

/**
       * @brief Assigns a new regular expression to a regex object from a
       * string containing a regular expression pattern.
       *
       * @param __s     A string containing a regular expression pattern.
       * @param __flags Syntax option flags.
       *
       * @throws regex_error if __s does not contain a valid regular
       * expression pattern interpreted according to @p __flags.  If
       * regex_error is thrown, *this remains unchanged.
       */
      template<typename _Ch_traits, typename _Alloc>
	basic_regex&
	assign(const basic_string<_Ch_type, _Ch_traits, _Alloc>& __s,
	       flag_type __flags = ECMAScript)
	{
	  return this->assign(basic_regex(__s.data(), __s.data() + __s.size(),
					  _M_loc, __flags));
	}

/**
       * @brief Assigns a new regular expression to a regex object.
       *
       * @param __first The start of a range containing a valid regular
       *                expression.
       * @param __last  The end of a range containing a valid regular
       *                expression.
       * @param __flags Syntax option flags.
       *
       * @throws regex_error if p does not contain a valid regular
       * expression pattern interpreted according to @p __flags.  If
       * regex_error is thrown, the object remains unchanged.
       */
      template<typename _InputIterator>
	basic_regex&
	assign(_InputIterator __first, _InputIterator __last,
	       flag_type __flags = ECMAScript)
	{ return this->assign(string_type(__first, __last), __flags); }

/**
       * @brief Assigns a new regular expression to a regex object.
       *
       * @param __l     An initializer list representing a regular expression.
       * @param __flags Syntax option flags.
       *
       * @throws regex_error if @p __l does not contain a valid
       * regular expression pattern interpreted according to @p
       * __flags.  If regex_error is thrown, the object remains
       * unchanged.
       */
      basic_regex&
      assign(initializer_list<_Ch_type> __l, flag_type __flags = ECMAScript)
      { return this->assign(__l.begin(), __l.end(), __flags); }

// [7.8.4] const operations
      /**
       * @brief Gets the number of marked subexpressions within the regular
       * expression.
       */
      unsigned int
      mark_count() const
      {
	if (_M_automaton)
	  return _M_automaton->_M_sub_count() - 1;
	return 0;
      }

/**
       * @brief Gets the flags used to construct the regular expression
       * or in the last call to assign().
       */
      flag_type
      flags() const
      { return _M_flags; }

// [7.8.5] locale
      /**
       * @brief Imbues the regular expression object with the given locale.
       *
       * @param __loc A locale.
       */
      locale_type
      imbue(locale_type __loc)
      {
	std::swap(__loc, _M_loc);
	_M_automaton.reset();
	return __loc;
      }

/**
       * @brief Gets the locale currently imbued in the regular expression
       *        object.
       */
      locale_type
      getloc() const
      { return _M_loc; }

// [7.8.6] swap
      /**
       * @brief Swaps the contents of two regular expression objects.
       *
       * @param __rhs Another regular expression object.
       */
      void
      swap(basic_regex& __rhs)
      {
	std::swap(_M_flags, __rhs._M_flags);
	std::swap(_M_loc, __rhs._M_loc);
	std::swap(_M_automaton, __rhs._M_automaton);
      }

#ifdef _GLIBCXX_DEBUG
      void
      _M_dot(std::ostream& __ostr)
      { _M_automaton->_M_dot(__ostr); }
#endif

private:
      typedef std::shared_ptr<const __detail::_NFA<_Rx_traits>> _AutomatonPtr;

template<typename _FwdIter>
	basic_regex(_FwdIter __first, _FwdIter __last, locale_type __loc,
		    flag_type __f)
	: _M_flags(__f), _M_loc(std::move(__loc)),
	_M_automaton(__detail::__compile_nfa<_Rx_traits>(
	  std::move(__first), std::move(__last), _M_loc, _M_flags))
	{ }

template<typename _Bp, typename _Ap, typename _Cp, typename _Rp,
	__detail::_RegexExecutorPolicy, bool>
	friend bool
	__detail::__regex_algo_impl(_Bp, _Bp, match_results<_Bp, _Ap>&,
				    const basic_regex<_Cp, _Rp>&,
				    regex_constants::match_flag_type);

template<typename, typename, typename, bool>
	friend class __detail::_Executor;

flag_type		_M_flags;
      locale_type	_M_loc;
      _AutomatonPtr	_M_automaton;
    };

#if __cplusplus < 201703L
  template<typename _Ch, typename _Tr>
    constexpr regex_constants::syntax_option_type
    basic_regex<_Ch, _Tr>::icase;

template<typename _Ch, typename _Tr>
    constexpr regex_constants::syntax_option_type
    basic_regex<_Ch, _Tr>::nosubs;

template<typename _Ch, typename _Tr>
    constexpr regex_constants::syntax_option_type
    basic_regex<_Ch, _Tr>::optimize;

template<typename _Ch, typename _Tr>
    constexpr regex_constants::syntax_option_type
    basic_regex<_Ch, _Tr>::collate;

template<typename _Ch, typename _Tr>
    constexpr regex_constants::syntax_option_type
    basic_regex<_Ch, _Tr>::ECMAScript;

template<typename _Ch, typename _Tr>
    constexpr regex_constants::syntax_option_type
    basic_regex<_Ch, _Tr>::basic;

template<typename _Ch, typename _Tr>
    constexpr regex_constants::syntax_option_type
    basic_regex<_Ch, _Tr>::extended;

template<typename _Ch, typename _Tr>
    constexpr regex_constants::syntax_option_type
    basic_regex<_Ch, _Tr>::awk;

template<typename _Ch, typename _Tr>
    constexpr regex_constants::syntax_option_type
    basic_regex<_Ch, _Tr>::grep;

template<typename _Ch, typename _Tr>
    constexpr regex_constants::syntax_option_type
    basic_regex<_Ch, _Tr>::egrep;
#endif // ! C++17

#if __cpp_deduction_guides >= 201606
  template<typename _ForwardIterator>
    basic_regex(_ForwardIterator, _ForwardIterator,
		regex_constants::syntax_option_type = {})
      -> basic_regex<typename iterator_traits<_ForwardIterator>::value_type>;
#endif

/** @brief Standard regular expressions. */
  typedef basic_regex<char>    regex;

#ifdef _GLIBCXX_USE_WCHAR_T
  /** @brief Standard wide-character regular expressions. */
  typedef basic_regex<wchar_t> wregex;
#endif

// [7.8.6] basic_regex swap
  /**
   * @brief Swaps the contents of two regular expression objects.
   * @param __lhs First regular expression.
   * @param __rhs Second regular expression.
   */
  template<typename _Ch_type, typename _Rx_traits>
    inline void
    swap(basic_regex<_Ch_type, _Rx_traits>& __lhs,
	 basic_regex<_Ch_type, _Rx_traits>& __rhs)
    { __lhs.swap(__rhs); }

// [7.9] Class template sub_match
  /**
   * A sequence of characters matched by a particular marked sub-expression.
   *
   * An object of this class is essentially a pair of iterators marking a
   * matched subexpression within a regular expression pattern match. Such
   * objects can be converted to and compared with std::basic_string objects
   * of a similar base character type as the pattern matched by the regular
   * expression.
   *
   * The iterators that make up the pair are the usual half-open interval
   * referencing the actual original pattern matched.
   */
  template<typename _BiIter>
    class sub_match : public std::pair<_BiIter, _BiIter>
    {
      typedef iterator_traits<_BiIter>			__iter_traits;
	
    public:
      typedef typename __iter_traits::value_type      	value_type;
      typedef typename __iter_traits::difference_type 	difference_type;
      typedef _BiIter				   iterator;
      typedef std::basic_string<value_type>	     string_type;

bool matched;

constexpr sub_match() : matched() { }

/**
       * Gets the length of the matching sequence.
       */
      difference_type
      length() const
      { return this->matched ? std::distance(this->first, this->second) : 0; }

/**
       * @brief Gets the matching sequence as a string.
       *
       * @returns the matching sequence as a string.
       *
       * This is the implicit conversion operator.  It is identical to the
       * str() member function except that it will want to pop up in
       * unexpected places and cause a great deal of confusion and cursing
       * from the unwary.
       */
      operator string_type() const
      {
	return this->matched
	  ? string_type(this->first, this->second)
	  : string_type();
      }

/**
       * @brief Gets the matching sequence as a string.
       *
       * @returns the matching sequence as a string.
       */
      string_type
      str() const
      {
	return this->matched
	  ? string_type(this->first, this->second)
	  : string_type();
      }

/**
       * @brief Compares this and another matched sequence.
       *
       * @param __s Another matched sequence to compare to this one.
       *
       * @retval <0 this matched sequence will collate before @p __s.
       * @retval =0 this matched sequence is equivalent to @p __s.
       * @retval <0 this matched sequence will collate after @p __s.
       */
      int
      compare(const sub_match& __s) const
      { return this->str().compare(__s.str()); }

/**
       * @brief Compares this sub_match to a string.
       *
       * @param __s A string to compare to this sub_match.
       *
       * @retval <0 this matched sequence will collate before @p __s.
       * @retval =0 this matched sequence is equivalent to @p __s.
       * @retval <0 this matched sequence will collate after @p __s.
       */
      int
      compare(const string_type& __s) const
      { return this->str().compare(__s); }

/**
       * @brief Compares this sub_match to a C-style string.
       *
       * @param __s A C-style string to compare to this sub_match.
       *
       * @retval <0 this matched sequence will collate before @p __s.
       * @retval =0 this matched sequence is equivalent to @p __s.
       * @retval <0 this matched sequence will collate after @p __s.
       */
      int
      compare(const value_type* __s) const
      { return this->str().compare(__s); }
    };

/** @brief Standard regex submatch over a C-style null-terminated string. */
  typedef sub_match<const char*>	     csub_match;

/** @brief Standard regex submatch over a standard string. */
  typedef sub_match<string::const_iterator>  ssub_match;

#ifdef _GLIBCXX_USE_WCHAR_T
  /** @brief Regex submatch over a C-style null-terminated wide string. */
  typedef sub_match<const wchar_t*>	  wcsub_match;

/** @brief Regex submatch over a standard wide string. */
  typedef sub_match<wstring::const_iterator> wssub_match;
#endif

// [7.9.2] sub_match non-member operators

/**
   * @brief Tests the equivalence of two regular expression submatches.
   * @param __lhs First regular expression submatch.
   * @param __rhs Second regular expression submatch.
   * @returns true if @a __lhs  is equivalent to @a __rhs, false otherwise.
   */
  template<typename _BiIter>
    inline bool
    operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
    { return __lhs.compare(__rhs) == 0; }

/**
   * @brief Tests the inequivalence of two regular expression submatches.
   * @param __lhs First regular expression submatch.
   * @param __rhs Second regular expression submatch.
   * @returns true if @a __lhs  is not equivalent to @a __rhs, false otherwise.
   */
  template<typename _BiIter>
    inline bool
    operator!=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
    { return __lhs.compare(__rhs) != 0; }

/**
   * @brief Tests the ordering of two regular expression submatches.
   * @param __lhs First regular expression submatch.
   * @param __rhs Second regular expression submatch.
   * @returns true if @a __lhs precedes @a __rhs, false otherwise.
   */
  template<typename _BiIter>
    inline bool
    operator<(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
    { return __lhs.compare(__rhs) < 0; }

/**
   * @brief Tests the ordering of two regular expression submatches.
   * @param __lhs First regular expression submatch.
   * @param __rhs Second regular expression submatch.
   * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
   */
  template<typename _BiIter>
    inline bool
    operator<=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
    { return __lhs.compare(__rhs) <= 0; }

/**
   * @brief Tests the ordering of two regular expression submatches.
   * @param __lhs First regular expression submatch.
   * @param __rhs Second regular expression submatch.
   * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
   */
  template<typename _BiIter>
    inline bool
    operator>=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
    { return __lhs.compare(__rhs) >= 0; }

/**
   * @brief Tests the ordering of two regular expression submatches.
   * @param __lhs First regular expression submatch.
   * @param __rhs Second regular expression submatch.
   * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
   */
  template<typename _BiIter>
    inline bool
    operator>(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
    { return __lhs.compare(__rhs) > 0; }

// Alias for sub_match'd string.
  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
    using __sub_match_string = basic_string<
			      typename iterator_traits<_Bi_iter>::value_type,
			      _Ch_traits, _Ch_alloc>;

/**
   * @brief Tests the equivalence of a string and a regular expression
   *        submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs  is equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
    inline bool
    operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    {
      typedef typename sub_match<_Bi_iter>::string_type string_type;
      return __rhs.compare(string_type(__lhs.data(), __lhs.size())) == 0;
    }

/**
   * @brief Tests the inequivalence of a string and a regular expression
   *        submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs  is not equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
    inline bool
    operator!=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    { return !(__lhs == __rhs); }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs precedes @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
    inline bool
    operator<(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
	      const sub_match<_Bi_iter>& __rhs)
    {
      typedef typename sub_match<_Bi_iter>::string_type string_type;
      return __rhs.compare(string_type(__lhs.data(), __lhs.size())) > 0;
    }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
    inline bool
    operator>(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
	      const sub_match<_Bi_iter>& __rhs)
    { return __rhs < __lhs; }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
    inline bool
    operator>=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    { return !(__lhs < __rhs); }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
    inline bool
    operator<=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    { return !(__rhs < __lhs); }

/**
   * @brief Tests the equivalence of a regular expression submatch and a
   *        string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
    inline bool
    operator==(const sub_match<_Bi_iter>& __lhs,
	       const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
    {
      typedef typename sub_match<_Bi_iter>::string_type string_type;
      return __lhs.compare(string_type(__rhs.data(), __rhs.size())) == 0;
    }

/**
   * @brief Tests the inequivalence of a regular expression submatch and a
   *        string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
    inline bool
    operator!=(const sub_match<_Bi_iter>& __lhs,
	       const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
    { return !(__lhs == __rhs); }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs precedes @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc>
    inline bool
    operator<(const sub_match<_Bi_iter>& __lhs,
	      const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
    {
      typedef typename sub_match<_Bi_iter>::string_type string_type;
      return __lhs.compare(string_type(__rhs.data(), __rhs.size())) < 0;
    }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc>
    inline bool
    operator>(const sub_match<_Bi_iter>& __lhs,
	      const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
    { return __rhs < __lhs; }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc>
    inline bool
    operator>=(const sub_match<_Bi_iter>& __lhs,
	       const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
    { return !(__lhs < __rhs); }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
   */
  template<typename _Bi_iter, class _Ch_traits, class _Ch_alloc>
    inline bool
    operator<=(const sub_match<_Bi_iter>& __lhs,
	       const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
    { return !(__rhs < __lhs); }

/**
   * @brief Tests the equivalence of a C string and a regular expression
   *        submatch.
   * @param __lhs A C string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs  is equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    { return __rhs.compare(__lhs) == 0; }

/**
   * @brief Tests the inequivalence of an iterator value and a regular
   *        expression submatch.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator!=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    { return !(__lhs == __rhs); }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs precedes @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator<(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
	      const sub_match<_Bi_iter>& __rhs)
    { return __rhs.compare(__lhs) > 0; }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator>(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
	      const sub_match<_Bi_iter>& __rhs)
    { return __rhs < __lhs; }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator>=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    { return !(__lhs < __rhs); }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator<=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    { return !(__rhs < __lhs); }

/**
   * @brief Tests the equivalence of a regular expression submatch and a
   *        string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A pointer to a string?
   * @returns true if @a __lhs  is equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator==(const sub_match<_Bi_iter>& __lhs,
	       typename iterator_traits<_Bi_iter>::value_type const* __rhs)
    { return __lhs.compare(__rhs) == 0; }

/**
   * @brief Tests the inequivalence of a regular expression submatch and a
   *        string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A pointer to a string.
   * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator!=(const sub_match<_Bi_iter>& __lhs,
	       typename iterator_traits<_Bi_iter>::value_type const* __rhs)
    { return !(__lhs == __rhs); }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs precedes @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator<(const sub_match<_Bi_iter>& __lhs,
	      typename iterator_traits<_Bi_iter>::value_type const* __rhs)
    { return __lhs.compare(__rhs) < 0; }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator>(const sub_match<_Bi_iter>& __lhs,
	      typename iterator_traits<_Bi_iter>::value_type const* __rhs)
    { return __rhs < __lhs; }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator>=(const sub_match<_Bi_iter>& __lhs,
	       typename iterator_traits<_Bi_iter>::value_type const* __rhs)
    { return !(__lhs < __rhs); }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A string.
   * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator<=(const sub_match<_Bi_iter>& __lhs,
	       typename iterator_traits<_Bi_iter>::value_type const* __rhs)
    { return !(__rhs < __lhs); }

/**
   * @brief Tests the equivalence of a string and a regular expression
   *        submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    {
      typedef typename sub_match<_Bi_iter>::string_type string_type;
      return __rhs.compare(string_type(1, __lhs)) == 0;
    }

/**
   * @brief Tests the inequivalence of a string and a regular expression
   *        submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator!=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    { return !(__lhs == __rhs); }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs precedes @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator<(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
	      const sub_match<_Bi_iter>& __rhs)
    {
      typedef typename sub_match<_Bi_iter>::string_type string_type;
      return __rhs.compare(string_type(1, __lhs)) > 0;
    }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator>(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
	      const sub_match<_Bi_iter>& __rhs)
    { return __rhs < __lhs; }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator>=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    { return !(__lhs < __rhs); }

/**
   * @brief Tests the ordering of a string and a regular expression submatch.
   * @param __lhs A string.
   * @param __rhs A regular expression submatch.
   * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator<=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
	       const sub_match<_Bi_iter>& __rhs)
    { return !(__rhs < __lhs); }

/**
   * @brief Tests the equivalence of a regular expression submatch and a
   *        string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A const string reference.
   * @returns true if @a __lhs  is equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator==(const sub_match<_Bi_iter>& __lhs,
	       typename iterator_traits<_Bi_iter>::value_type const& __rhs)
    {
      typedef typename sub_match<_Bi_iter>::string_type string_type;
      return __lhs.compare(string_type(1, __rhs)) == 0;
    }

/**
   * @brief Tests the inequivalence of a regular expression submatch and a
   *        string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A const string reference.
   * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator!=(const sub_match<_Bi_iter>& __lhs,
	       typename iterator_traits<_Bi_iter>::value_type const& __rhs)
    { return !(__lhs == __rhs); }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A const string reference.
   * @returns true if @a __lhs precedes @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator<(const sub_match<_Bi_iter>& __lhs,
	      typename iterator_traits<_Bi_iter>::value_type const& __rhs)
    {
      typedef typename sub_match<_Bi_iter>::string_type string_type;
      return __lhs.compare(string_type(1, __rhs)) < 0;
    }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A const string reference.
   * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator>(const sub_match<_Bi_iter>& __lhs,
	      typename iterator_traits<_Bi_iter>::value_type const& __rhs)
    { return __rhs < __lhs; }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A const string reference.
   * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator>=(const sub_match<_Bi_iter>& __lhs,
	       typename iterator_traits<_Bi_iter>::value_type const& __rhs)
    { return !(__lhs < __rhs); }

/**
   * @brief Tests the ordering of a regular expression submatch and a string.
   * @param __lhs A regular expression submatch.
   * @param __rhs A const string reference.
   * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
   */
  template<typename _Bi_iter>
    inline bool
    operator<=(const sub_match<_Bi_iter>& __lhs,
	       typename iterator_traits<_Bi_iter>::value_type const& __rhs)
    { return !(__rhs < __lhs); }

/**
   * @brief Inserts a matched string into an output stream.
   *
   * @param __os The output stream.
   * @param __m  A submatch string.
   *
   * @returns the output stream with the submatch string inserted.
   */
  template<typename _Ch_type, typename _Ch_traits, typename _Bi_iter>
    inline
    basic_ostream<_Ch_type, _Ch_traits>&
    operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os,
	       const sub_match<_Bi_iter>& __m)
    { return __os << __m.str(); }

// [7.10] Class template match_results

/**
   * @brief The results of a match or search operation.
   *
   * A collection of character sequences representing the result of a regular
   * expression match.  Storage for the collection is allocated and freed as
   * necessary by the member functions of class template match_results.
   *
   * This class satisfies the Sequence requirements, with the exception that
   * only the operations defined for a const-qualified Sequence are supported.
   *
   * The sub_match object stored at index 0 represents sub-expression 0, i.e.
   * the whole match. In this case the %sub_match member matched is always true.
   * The sub_match object stored at index n denotes what matched the marked
   * sub-expression n within the matched expression. If the sub-expression n
   * participated in a regular expression match then the %sub_match member
   * matched evaluates to true, and members first and second denote the range
   * of characters [first, second) which formed that match. Otherwise matched
   * is false, and members first and second point to the end of the sequence
   * that was searched.
   *
   * @nosubgrouping
   */
  template<typename _Bi_iter,
	   typename _Alloc = allocator<sub_match<_Bi_iter> > >
    class match_results
    : private std::vector<sub_match<_Bi_iter>, _Alloc>
    {
    private:
      /*
       * The vector base is empty if this does not represent a match (!ready());
       * Otherwise if it's a match failure, it contains 3 elements:
       * [0] unmatched
       * [1] prefix
       * [2] suffix
       * Otherwise it contains n+4 elements where n is the number of marked
       * sub-expressions:
       * [0] entire match
       * [1] 1st marked subexpression
       * ...
       * [n] nth marked subexpression
       * [n+1] unmatched
       * [n+2] prefix
       * [n+3] suffix
       */
      typedef std::vector<sub_match<_Bi_iter>, _Alloc>     _Base_type;
      typedef std::iterator_traits<_Bi_iter>   	   	   __iter_traits;
      typedef regex_constants::match_flag_type		   match_flag_type;

public:
      /**
       * @name 10.? Public Types
       */
      //@{
      typedef sub_match<_Bi_iter>			   value_type;
      typedef const value_type&				   const_reference;
      typedef value_type&				   reference;
      typedef typename _Base_type::const_iterator	   const_iterator;
      typedef const_iterator				   iterator;
      typedef typename __iter_traits::difference_type	   difference_type;
      typedef typename allocator_traits<_Alloc>::size_type size_type;
      typedef _Alloc					   allocator_type;
      typedef typename __iter_traits::value_type 	   char_type;
      typedef std::basic_string<char_type>		   string_type;
      //@}

public:
      /**
       * @name 28.10.1 Construction, Copying, and Destruction
       */
      //@{

/**
       * @brief Constructs a default %match_results container.
       * @post size() returns 0 and str() returns an empty string.
       */
      explicit
      match_results(const _Alloc& __a = _Alloc())
      : _Base_type(__a)
      { }

/**
       * @brief Copy constructs a %match_results.
       */
      match_results(const match_results& __rhs) = default;

/**
       * @brief Move constructs a %match_results.
       */
      match_results(match_results&& __rhs) noexcept = default;

/**
       * @brief Assigns rhs to *this.
       */
      match_results&
      operator=(const match_results& __rhs) = default;

/**
       * @brief Move-assigns rhs to *this.
       */
      match_results&
      operator=(match_results&& __rhs) = default;

/**
       * @brief Destroys a %match_results object.
       */
      ~match_results()
      { }

//@}

// 28.10.2, state:
      /**
       * @brief Indicates if the %match_results is ready.
       * @retval true   The object has a fully-established result state.
       * @retval false  The object is not ready.
       */
      bool ready() const { return !_Base_type::empty(); }

/**
       * @name 28.10.2 Size
       */
      //@{

/**
       * @brief Gets the number of matches and submatches.
       *
       * The number of matches for a given regular expression will be either 0
       * if there was no match or mark_count() + 1 if a match was successful.
       * Some matches may be empty.
       *
       * @returns the number of matches found.
       */
      size_type
      size() const
      { return _Base_type::empty() ? 0 : _Base_type::size() - 3; }

size_type
      max_size() const
      { return _Base_type::max_size(); }

/**
       * @brief Indicates if the %match_results contains no results.
       * @retval true The %match_results object is empty.
       * @retval false The %match_results object is not empty.
       */
      bool
      empty() const
      { return size() == 0; }

//@}

/**
       * @name 10.3 Element Access
       */
      //@{

/**
       * @brief Gets the length of the indicated submatch.
       * @param __sub indicates the submatch.
       * @pre   ready() == true
       *
       * This function returns the length of the indicated submatch, or the
       * length of the entire match if @p __sub is zero (the default).
       */
      difference_type
      length(size_type __sub = 0) const
      { return (*this)[__sub].length(); }

/**
       * @brief Gets the offset of the beginning of the indicated submatch.
       * @param __sub indicates the submatch.
       * @pre   ready() == true
       *
       * This function returns the offset from the beginning of the target
       * sequence to the beginning of the submatch, unless the value of @p __sub
       * is zero (the default), in which case this function returns the offset
       * from the beginning of the target sequence to the beginning of the
       * match.
       */
      difference_type
      position(size_type __sub = 0) const
      { return std::distance(_M_begin, (*this)[__sub].first); }

/**
       * @brief Gets the match or submatch converted to a string type.
       * @param __sub indicates the submatch.
       * @pre   ready() == true
       *
       * This function gets the submatch (or match, if @p __sub is
       * zero) extracted from the target range and converted to the
       * associated string type.
       */
      string_type
      str(size_type __sub = 0) const
      { return string_type((*this)[__sub]); }

/**
       * @brief Gets a %sub_match reference for the match or submatch.
       * @param __sub indicates the submatch.
       * @pre   ready() == true
       *
       * This function gets a reference to the indicated submatch, or
       * the entire match if @p __sub is zero.
       *
       * If @p __sub >= size() then this function returns a %sub_match with a
       * special value indicating no submatch.
       */
      const_reference
      operator[](size_type __sub) const
      {
	__glibcxx_assert( ready() );
	return __sub < size()
	       ? _Base_type::operator[](__sub)
	       : _M_unmatched_sub();
      }

/**
       * @brief Gets a %sub_match representing the match prefix.
       * @pre   ready() == true
       *
       * This function gets a reference to a %sub_match object representing the
       * part of the target range between the start of the target range and the
       * start of the match.
       */
      const_reference
      prefix() const
      {
	__glibcxx_assert( ready() );
	return !empty() ? _M_prefix() : _M_unmatched_sub();
      }

/**
       * @brief Gets a %sub_match representing the match suffix.
       * @pre   ready() == true
       *
       * This function gets a reference to a %sub_match object representing the
       * part of the target range between the end of the match and the end of
       * the target range.
       */
      const_reference
      suffix() const
      {
	__glibcxx_assert( ready() );
	return !empty() ? _M_suffix() : _M_unmatched_sub();
      }

/**
       * @brief Gets an iterator to the start of the %sub_match collection.
       */
      const_iterator
      begin() const
      { return _Base_type::begin(); }

/**
       * @brief Gets an iterator to the start of the %sub_match collection.
       */
      const_iterator
      cbegin() const
      { return this->begin(); }

/**
       * @brief Gets an iterator to one-past-the-end of the collection.
       */
      const_iterator
      end() const
      { return _Base_type::end() - (empty() ? 0 : 3); }

/**
       * @brief Gets an iterator to one-past-the-end of the collection.
       */
      const_iterator
      cend() const
      { return this->end(); }

//@}

/**
       * @name 10.4 Formatting
       *
       * These functions perform formatted substitution of the matched
       * character sequences into their target.  The format specifiers and
       * escape sequences accepted by these functions are determined by
       * their @p flags parameter as documented above.
       */
       //@{

/**
       * @pre   ready() == true
       */
      template<typename _Out_iter>
	_Out_iter
	format(_Out_iter __out, const char_type* __fmt_first,
	       const char_type* __fmt_last,
	       match_flag_type __flags = regex_constants::format_default) const;

/**
       * @pre   ready() == true
       */
      template<typename _Out_iter, typename _St, typename _Sa>
	_Out_iter
	format(_Out_iter __out, const basic_string<char_type, _St, _Sa>& __fmt,
	       match_flag_type __flags = regex_constants::format_default) const
	{
	  return format(__out, __fmt.data(), __fmt.data() + __fmt.size(),
			__flags);
	}

/**
       * @pre   ready() == true
       */
      template<typename _St, typename _Sa>
	basic_string<char_type, _St, _Sa>
	format(const basic_string<char_type, _St, _Sa>& __fmt,
	       match_flag_type __flags = regex_constants::format_default) const
	{
	  basic_string<char_type, _St, _Sa> __result;
	  format(std::back_inserter(__result), __fmt, __flags);
	  return __result;
	}

/**
       * @pre   ready() == true
       */
      string_type
      format(const char_type* __fmt,
	     match_flag_type __flags = regex_constants::format_default) const
      {
	string_type __result;
	format(std::back_inserter(__result),
	       __fmt,
	       __fmt + char_traits<char_type>::length(__fmt),
	       __flags);
	return __result;
      }

//@}

/**
       * @name 10.5 Allocator
       */
      //@{

/**
       * @brief Gets a copy of the allocator.
       */
      allocator_type
      get_allocator() const
      { return _Base_type::get_allocator(); }

//@}

/**
       * @name 10.6 Swap
       */
       //@{

/**
       * @brief Swaps the contents of two match_results.
       */
      void
      swap(match_results& __that)
      {
	using std::swap;
	_Base_type::swap(__that);
	swap(_M_begin, __that._M_begin);
      }
      //@}

private:
      template<typename, typename, typename, bool>
	friend class __detail::_Executor;

template<typename, typename, typename>
	friend class regex_iterator;

void
      _M_resize(unsigned int __size)
      { _Base_type::resize(__size + 3); }

const_reference
      _M_unmatched_sub() const
      { return _Base_type::operator[](_Base_type::size() - 3); }

sub_match<_Bi_iter>&
      _M_unmatched_sub()
      { return _Base_type::operator[](_Base_type::size() - 3); }

const_reference
      _M_prefix() const
      { return _Base_type::operator[](_Base_type::size() - 2); }

sub_match<_Bi_iter>&
      _M_prefix()
      { return _Base_type::operator[](_Base_type::size() - 2); }

const_reference
      _M_suffix() const
      { return _Base_type::operator[](_Base_type::size() - 1); }

sub_match<_Bi_iter>&
      _M_suffix()
      { return _Base_type::operator[](_Base_type::size() - 1); }

_Bi_iter _M_begin;
    };

typedef match_results<const char*>		 cmatch;
  typedef match_results<string::const_iterator>	 smatch;
#ifdef _GLIBCXX_USE_WCHAR_T
  typedef match_results<const wchar_t*>		 wcmatch;
  typedef match_results<wstring::const_iterator> wsmatch;
#endif

// match_results comparisons
  /**
   * @brief Compares two match_results for equality.
   * @returns true if the two objects refer to the same match,
   * false otherwise.
   */
  template<typename _Bi_iter, typename _Alloc>
    inline bool
    operator==(const match_results<_Bi_iter, _Alloc>& __m1,
	       const match_results<_Bi_iter, _Alloc>& __m2)
    {
      if (__m1.ready() != __m2.ready())
	return false;
      if (!__m1.ready())  // both are not ready
	return true;
      if (__m1.empty() != __m2.empty())
	return false;
      if (__m1.empty())   // both are empty
	return true;
      return __m1.prefix() == __m2.prefix()
	&& __m1.size() == __m2.size()
	&& std::equal(__m1.begin(), __m1.end(), __m2.begin())
	&& __m1.suffix() == __m2.suffix();
    }

/**
   * @brief Compares two match_results for inequality.
   * @returns true if the two objects do not refer to the same match,
   * false otherwise.
   */
  template<typename _Bi_iter, class _Alloc>
    inline bool
    operator!=(const match_results<_Bi_iter, _Alloc>& __m1,
	       const match_results<_Bi_iter, _Alloc>& __m2)
    { return !(__m1 == __m2); }

// [7.10.6] match_results swap
  /**
   * @brief Swaps two match results.
   * @param __lhs A match result.
   * @param __rhs A match result.
   *
   * The contents of the two match_results objects are swapped.
   */
  template<typename _Bi_iter, typename _Alloc>
    inline void
    swap(match_results<_Bi_iter, _Alloc>& __lhs,
	 match_results<_Bi_iter, _Alloc>& __rhs)
    { __lhs.swap(__rhs); }

_GLIBCXX_END_NAMESPACE_CXX11

// [7.11.2] Function template regex_match
  /**
   * @name Matching, Searching, and Replacing
   */
  //@{

/**
   * @brief Determines if there is a match between the regular expression @p e
   * and all of the character sequence [first, last).
   *
   * @param __s     Start of the character sequence to match.
   * @param __e     One-past-the-end of the character sequence to match.
   * @param __m     The match results.
   * @param __re    The regular expression.
   * @param __flags Controls how the regular expression is matched.
   *
   * @retval true  A match exists.
   * @retval false Otherwise.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Bi_iter, typename _Alloc,
	   typename _Ch_type, typename _Rx_traits>
    inline bool
    regex_match(_Bi_iter				 __s,
		_Bi_iter				 __e,
		match_results<_Bi_iter, _Alloc>&	 __m,
		const basic_regex<_Ch_type, _Rx_traits>& __re,
		regex_constants::match_flag_type	 __flags
			       = regex_constants::match_default)
    {
      return __detail::__regex_algo_impl<_Bi_iter, _Alloc, _Ch_type, _Rx_traits,
	__detail::_RegexExecutorPolicy::_S_auto, true>
	  (__s, __e, __m, __re, __flags);
    }

/**
   * @brief Indicates if there is a match between the regular expression @p e
   * and all of the character sequence [first, last).
   *
   * @param __first Beginning of the character sequence to match.
   * @param __last  One-past-the-end of the character sequence to match.
   * @param __re    The regular expression.
   * @param __flags Controls how the regular expression is matched.
   *
   * @retval true  A match exists.
   * @retval false Otherwise.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Bi_iter, typename _Ch_type, typename _Rx_traits>
    inline bool
    regex_match(_Bi_iter __first, _Bi_iter __last,
		const basic_regex<_Ch_type, _Rx_traits>& __re,
		regex_constants::match_flag_type __flags
		= regex_constants::match_default)
    {
      match_results<_Bi_iter> __what;
      return regex_match(__first, __last, __what, __re, __flags);
    }

/**
   * @brief Determines if there is a match between the regular expression @p e
   * and a C-style null-terminated string.
   *
   * @param __s  The C-style null-terminated string to match.
   * @param __m  The match results.
   * @param __re The regular expression.
   * @param __f  Controls how the regular expression is matched.
   *
   * @retval true  A match exists.
   * @retval false Otherwise.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Ch_type, typename _Alloc, typename _Rx_traits>
    inline bool
    regex_match(const _Ch_type* __s,
		match_results<const _Ch_type*, _Alloc>& __m,
		const basic_regex<_Ch_type, _Rx_traits>& __re,
		regex_constants::match_flag_type __f
		= regex_constants::match_default)
    { return regex_match(__s, __s + _Rx_traits::length(__s), __m, __re, __f); }

/**
   * @brief Determines if there is a match between the regular expression @p e
   * and a string.
   *
   * @param __s     The string to match.
   * @param __m     The match results.
   * @param __re    The regular expression.
   * @param __flags Controls how the regular expression is matched.
   *
   * @retval true  A match exists.
   * @retval false Otherwise.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Ch_traits, typename _Ch_alloc,
	   typename _Alloc, typename _Ch_type, typename _Rx_traits>
    inline bool
    regex_match(const basic_string<_Ch_type, _Ch_traits, _Ch_alloc>& __s,
		match_results<typename basic_string<_Ch_type,
		_Ch_traits, _Ch_alloc>::const_iterator, _Alloc>& __m,
		const basic_regex<_Ch_type, _Rx_traits>& __re,
		regex_constants::match_flag_type __flags
		= regex_constants::match_default)
    { return regex_match(__s.begin(), __s.end(), __m, __re, __flags); }

// _GLIBCXX_RESOLVE_LIB_DEFECTS
  // 2329. regex_match() with match_results should forbid temporary strings
  /// Prevent unsafe attempts to get match_results from a temporary string.
  template<typename _Ch_traits, typename _Ch_alloc,
	   typename _Alloc, typename _Ch_type, typename _Rx_traits>
    bool
    regex_match(const basic_string<_Ch_type, _Ch_traits, _Ch_alloc>&&,
		match_results<typename basic_string<_Ch_type,
		_Ch_traits, _Ch_alloc>::const_iterator, _Alloc>&,
		const basic_regex<_Ch_type, _Rx_traits>&,
		regex_constants::match_flag_type
		= regex_constants::match_default) = delete;

/**
   * @brief Indicates if there is a match between the regular expression @p e
   * and a C-style null-terminated string.
   *
   * @param __s  The C-style null-terminated string to match.
   * @param __re The regular expression.
   * @param __f  Controls how the regular expression is matched.
   *
   * @retval true  A match exists.
   * @retval false Otherwise.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Ch_type, class _Rx_traits>
    inline bool
    regex_match(const _Ch_type* __s,
		const basic_regex<_Ch_type, _Rx_traits>& __re,
		regex_constants::match_flag_type __f
		= regex_constants::match_default)
    { return regex_match(__s, __s + _Rx_traits::length(__s), __re, __f); }

/**
   * @brief Indicates if there is a match between the regular expression @p e
   * and a string.
   *
   * @param __s     [IN] The string to match.
   * @param __re    [IN] The regular expression.
   * @param __flags [IN] Controls how the regular expression is matched.
   *
   * @retval true  A match exists.
   * @retval false Otherwise.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Ch_traits, typename _Str_allocator,
	   typename _Ch_type, typename _Rx_traits>
    inline bool
    regex_match(const basic_string<_Ch_type, _Ch_traits, _Str_allocator>& __s,
		const basic_regex<_Ch_type, _Rx_traits>& __re,
		regex_constants::match_flag_type __flags
		= regex_constants::match_default)
    { return regex_match(__s.begin(), __s.end(), __re, __flags); }

// [7.11.3] Function template regex_search
  /**
   * Searches for a regular expression within a range.
   * @param __s     [IN]  The start of the string to search.
   * @param __e     [IN]  One-past-the-end of the string to search.
   * @param __m     [OUT] The match results.
   * @param __re    [IN]  The regular expression to search for.
   * @param __flags [IN]  Search policy flags.
   * @retval true  A match was found within the string.
   * @retval false No match was found within the string, the content of %m is
   *               undefined.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Bi_iter, typename _Alloc,
	   typename _Ch_type, typename _Rx_traits>
    inline bool
    regex_search(_Bi_iter __s, _Bi_iter __e,
		 match_results<_Bi_iter, _Alloc>& __m,
		 const basic_regex<_Ch_type, _Rx_traits>& __re,
		 regex_constants::match_flag_type __flags
		 = regex_constants::match_default)
    {
      return __detail::__regex_algo_impl<_Bi_iter, _Alloc, _Ch_type, _Rx_traits,
	__detail::_RegexExecutorPolicy::_S_auto, false>
	  (__s, __e, __m, __re, __flags);
    }

/**
   * Searches for a regular expression within a range.
   * @param __first [IN]  The start of the string to search.
   * @param __last  [IN]  One-past-the-end of the string to search.
   * @param __re    [IN]  The regular expression to search for.
   * @param __flags [IN]  Search policy flags.
   * @retval true  A match was found within the string.
   * @retval false No match was found within the string.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Bi_iter, typename _Ch_type, typename _Rx_traits>
    inline bool
    regex_search(_Bi_iter __first, _Bi_iter __last,
		 const basic_regex<_Ch_type, _Rx_traits>& __re,
		 regex_constants::match_flag_type __flags
		 = regex_constants::match_default)
    {
      match_results<_Bi_iter> __what;
      return regex_search(__first, __last, __what, __re, __flags);
    }

/**
   * @brief Searches for a regular expression within a C-string.
   * @param __s [IN]  A C-string to search for the regex.
   * @param __m [OUT] The set of regex matches.
   * @param __e [IN]  The regex to search for in @p s.
   * @param __f [IN]  The search flags.
   * @retval true  A match was found within the string.
   * @retval false No match was found within the string, the content of %m is
   *               undefined.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Ch_type, class _Alloc, class _Rx_traits>
    inline bool
    regex_search(const _Ch_type* __s,
		 match_results<const _Ch_type*, _Alloc>& __m,
		 const basic_regex<_Ch_type, _Rx_traits>& __e,
		 regex_constants::match_flag_type __f
		 = regex_constants::match_default)
    { return regex_search(__s, __s + _Rx_traits::length(__s), __m, __e, __f); }

/**
   * @brief Searches for a regular expression within a C-string.
   * @param __s [IN]  The C-string to search.
   * @param __e [IN]  The regular expression to search for.
   * @param __f [IN]  Search policy flags.
   * @retval true  A match was found within the string.
   * @retval false No match was found within the string.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Ch_type, typename _Rx_traits>
    inline bool
    regex_search(const _Ch_type* __s,
		 const basic_regex<_Ch_type, _Rx_traits>& __e,
		 regex_constants::match_flag_type __f
		 = regex_constants::match_default)
    { return regex_search(__s, __s + _Rx_traits::length(__s), __e, __f); }

/**
   * @brief Searches for a regular expression within a string.
   * @param __s     [IN]  The string to search.
   * @param __e     [IN]  The regular expression to search for.
   * @param __flags [IN]  Search policy flags.
   * @retval true  A match was found within the string.
   * @retval false No match was found within the string.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Ch_traits, typename _String_allocator,
	   typename _Ch_type, typename _Rx_traits>
    inline bool
    regex_search(const basic_string<_Ch_type, _Ch_traits,
		 _String_allocator>& __s,
		 const basic_regex<_Ch_type, _Rx_traits>& __e,
		 regex_constants::match_flag_type __flags
		 = regex_constants::match_default)
    { return regex_search(__s.begin(), __s.end(), __e, __flags); }

/**
   * @brief Searches for a regular expression within a string.
   * @param __s [IN]  A C++ string to search for the regex.
   * @param __m [OUT] The set of regex matches.
   * @param __e [IN]  The regex to search for in @p s.
   * @param __f [IN]  The search flags.
   * @retval true  A match was found within the string.
   * @retval false No match was found within the string, the content of %m is
   *               undefined.
   *
   * @throws an exception of type regex_error.
   */
  template<typename _Ch_traits, typename _Ch_alloc,
	   typename _Alloc, typename _Ch_type,
	   typename _Rx_traits>
    inline bool
    regex_search(const basic_string<_Ch_type, _Ch_traits, _Ch_alloc>& __s,
		 match_results<typename basic_string<_Ch_type,
		 _Ch_traits, _Ch_alloc>::const_iterator, _Alloc>& __m,
		 const basic_regex<_Ch_type, _Rx_traits>& __e,
		 regex_constants::match_flag_type __f
		 = regex_constants::match_default)
    { return regex_search(__s.begin(), __s.end(), __m, __e, __f); }

// _GLIBCXX_RESOLVE_LIB_DEFECTS
  // 2329. regex_search() with match_results should forbid temporary strings
  /// Prevent unsafe attempts to get match_results from a temporary string.
  template<typename _Ch_traits, typename _Ch_alloc,
	   typename _Alloc, typename _Ch_type,
	   typename _Rx_traits>
    bool
    regex_search(const basic_string<_Ch_type, _Ch_traits, _Ch_alloc>&&,
		 match_results<typename basic_string<_Ch_type,
		 _Ch_traits, _Ch_alloc>::const_iterator, _Alloc>&,
		 const basic_regex<_Ch_type, _Rx_traits>&,
		 regex_constants::match_flag_type
		 = regex_constants::match_default) = delete;

// std [28.11.4] Function template regex_replace
  /**
   * @brief Search for a regular expression within a range for multiple times,
   and replace the matched parts through filling a format string.
   * @param __out   [OUT] The output iterator.
   * @param __first [IN]  The start of the string to search.
   * @param __last  [IN]  One-past-the-end of the string to search.
   * @param __e     [IN]  The regular expression to search for.
   * @param __fmt   [IN]  The format string.
   * @param __flags [IN]  Search and replace policy flags.
   *
   * @returns __out
   * @throws an exception of type regex_error.
   */
  template<typename _Out_iter, typename _Bi_iter,
	   typename _Rx_traits, typename _Ch_type,
	   typename _St, typename _Sa>
    inline _Out_iter
    regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last,
		  const basic_regex<_Ch_type, _Rx_traits>& __e,
		  const basic_string<_Ch_type, _St, _Sa>& __fmt,
		  regex_constants::match_flag_type __flags
		  = regex_constants::match_default)
    {
      return regex_replace(__out, __first, __last, __e, __fmt.c_str(), __flags);
    }

/**
   * @brief Search for a regular expression within a range for multiple times,
   and replace the matched parts through filling a format C-string.
   * @param __out   [OUT] The output iterator.
   * @param __first [IN]  The start of the string to search.
   * @param __last  [IN]  One-past-the-end of the string to search.
   * @param __e     [IN]  The regular expression to search for.
   * @param __fmt   [IN]  The format C-string.
   * @param __flags [IN]  Search and replace policy flags.
   *
   * @returns __out
   * @throws an exception of type regex_error.
   */
  template<typename _Out_iter, typename _Bi_iter,
	   typename _Rx_traits, typename _Ch_type>
    _Out_iter
    regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last,
		  const basic_regex<_Ch_type, _Rx_traits>& __e,
		  const _Ch_type* __fmt,
		  regex_constants::match_flag_type __flags
		  = regex_constants::match_default);

/**
   * @brief Search for a regular expression within a string for multiple times,
   and replace the matched parts through filling a format string.
   * @param __s     [IN] The string to search and replace.
   * @param __e     [IN] The regular expression to search for.
   * @param __fmt   [IN] The format string.
   * @param __flags [IN] Search and replace policy flags.
   *
   * @returns The string after replacing.
   * @throws an exception of type regex_error.
   */
  template<typename _Rx_traits, typename _Ch_type,
	   typename _St, typename _Sa, typename _Fst, typename _Fsa>
    inline basic_string<_Ch_type, _St, _Sa>
    regex_replace(const basic_string<_Ch_type, _St, _Sa>& __s,
		  const basic_regex<_Ch_type, _Rx_traits>& __e,
		  const basic_string<_Ch_type, _Fst, _Fsa>& __fmt,
		  regex_constants::match_flag_type __flags
		  = regex_constants::match_default)
    {
      basic_string<_Ch_type, _St, _Sa> __result;
      regex_replace(std::back_inserter(__result),
		    __s.begin(), __s.end(), __e, __fmt, __flags);
      return __result;
    }

/**
   * @brief Search for a regular expression within a string for multiple times,
   and replace the matched parts through filling a format C-string.
   * @param __s     [IN] The string to search and replace.
   * @param __e     [IN] The regular expression to search for.
   * @param __fmt   [IN] The format C-string.
   * @param __flags [IN] Search and replace policy flags.
   *
   * @returns The string after replacing.
   * @throws an exception of type regex_error.
   */
  template<typename _Rx_traits, typename _Ch_type,
	   typename _St, typename _Sa>
    inline basic_string<_Ch_type, _St, _Sa>
    regex_replace(const basic_string<_Ch_type, _St, _Sa>& __s,
		  const basic_regex<_Ch_type, _Rx_traits>& __e,
		  const _Ch_type* __fmt,
		  regex_constants::match_flag_type __flags
		  = regex_constants::match_default)
    {
      basic_string<_Ch_type, _St, _Sa> __result;
      regex_replace(std::back_inserter(__result),
		    __s.begin(), __s.end(), __e, __fmt, __flags);
      return __result;
    }

/**
   * @brief Search for a regular expression within a C-string for multiple
   times, and replace the matched parts through filling a format string.
   * @param __s     [IN] The C-string to search and replace.
   * @param __e     [IN] The regular expression to search for.
   * @param __fmt   [IN] The format string.
   * @param __flags [IN] Search and replace policy flags.
   *
   * @returns The string after replacing.
   * @throws an exception of type regex_error.
   */
  template<typename _Rx_traits, typename _Ch_type,
	   typename _St, typename _Sa>
    inline basic_string<_Ch_type>
    regex_replace(const _Ch_type* __s,
		  const basic_regex<_Ch_type, _Rx_traits>& __e,
		  const basic_string<_Ch_type, _St, _Sa>& __fmt,
		  regex_constants::match_flag_type __flags
		  = regex_constants::match_default)
    {
      basic_string<_Ch_type> __result;
      regex_replace(std::back_inserter(__result), __s,
		    __s + char_traits<_Ch_type>::length(__s),
		    __e, __fmt, __flags);
      return __result;
    }

/**
   * @brief Search for a regular expression within a C-string for multiple
   times, and replace the matched parts through filling a format C-string.
   * @param __s     [IN] The C-string to search and replace.
   * @param __e     [IN] The regular expression to search for.
   * @param __fmt   [IN] The format C-string.
   * @param __flags [IN] Search and replace policy flags.
   *
   * @returns The string after replacing.
   * @throws an exception of type regex_error.
   */
  template<typename _Rx_traits, typename _Ch_type>
    inline basic_string<_Ch_type>
    regex_replace(const _Ch_type* __s,
		  const basic_regex<_Ch_type, _Rx_traits>& __e,
		  const _Ch_type* __fmt,
		  regex_constants::match_flag_type __flags
		  = regex_constants::match_default)
    {
      basic_string<_Ch_type> __result;
      regex_replace(std::back_inserter(__result), __s,
		    __s + char_traits<_Ch_type>::length(__s),
		    __e, __fmt, __flags);
      return __result;
    }

//@}

_GLIBCXX_BEGIN_NAMESPACE_CXX11

// std [28.12] Class template regex_iterator
  /**
   * An iterator adaptor that will provide repeated calls of regex_search over
   * a range until no more matches remain.
   */
  template<typename _Bi_iter,
	   typename _Ch_type = typename iterator_traits<_Bi_iter>::value_type,
	   typename _Rx_traits = regex_traits<_Ch_type> >
    class regex_iterator
    {
    public:
      typedef basic_regex<_Ch_type, _Rx_traits>  regex_type;
      typedef match_results<_Bi_iter>	    value_type;
      typedef std::ptrdiff_t		     difference_type;
      typedef const value_type*		  pointer;
      typedef const value_type&		  reference;
      typedef std::forward_iterator_tag	  iterator_category;

/**
       * @brief Provides a singular iterator, useful for indicating
       * one-past-the-end of a range.
       */
      regex_iterator()
      : _M_pregex()
      { }

/**
       * Constructs a %regex_iterator...
       * @param __a  [IN] The start of a text range to search.
       * @param __b  [IN] One-past-the-end of the text range to search.
       * @param __re [IN] The regular expression to match.
       * @param __m  [IN] Policy flags for match rules.
       */
      regex_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re,
		     regex_constants::match_flag_type __m
		     = regex_constants::match_default)
      : _M_begin(__a), _M_end(__b), _M_pregex(&__re), _M_flags(__m), _M_match()
      {
	if (!regex_search(_M_begin, _M_end, _M_match, *_M_pregex, _M_flags))
	  *this = regex_iterator();
      }

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2332. regex_iterator should forbid temporary regexes
      regex_iterator(_Bi_iter, _Bi_iter, const regex_type&&,
		     regex_constants::match_flag_type
		     = regex_constants::match_default) = delete;
      /**
       * Copy constructs a %regex_iterator.
       */
      regex_iterator(const regex_iterator& __rhs) = default;

/**
       * @brief Assigns one %regex_iterator to another.
       */
      regex_iterator&
      operator=(const regex_iterator& __rhs) = default;

/**
       * @brief Tests the equivalence of two regex iterators.
       */
      bool
      operator==(const regex_iterator& __rhs) const;

/**
       * @brief Tests the inequivalence of two regex iterators.
       */
      bool
      operator!=(const regex_iterator& __rhs) const
      { return !(*this == __rhs); }

/**
       * @brief Dereferences a %regex_iterator.
       */
      const value_type&
      operator*() const
      { return _M_match; }

/**
       * @brief Selects a %regex_iterator member.
       */
      const value_type*
      operator->() const
      { return &_M_match; }

/**
       * @brief Increments a %regex_iterator.
       */
      regex_iterator&
      operator++();

/**
       * @brief Postincrements a %regex_iterator.
       */
      regex_iterator
      operator++(int)
      {
	auto __tmp = *this;
	++(*this);
	return __tmp;
      }

private:
      _Bi_iter				_M_begin;
      _Bi_iter				_M_end;
      const regex_type*			_M_pregex;
      regex_constants::match_flag_type	_M_flags;
      match_results<_Bi_iter>		_M_match;
    };

typedef regex_iterator<const char*>			cregex_iterator;
  typedef regex_iterator<string::const_iterator>	sregex_iterator;
#ifdef _GLIBCXX_USE_WCHAR_T
  typedef regex_iterator<const wchar_t*>		wcregex_iterator;
  typedef regex_iterator<wstring::const_iterator>	wsregex_iterator;
#endif

// [7.12.2] Class template regex_token_iterator
  /**
   * Iterates over submatches in a range (or @a splits a text string).
   *
   * The purpose of this iterator is to enumerate all, or all specified,
   * matches of a regular expression within a text range.  The dereferenced
   * value of an iterator of this class is a std::sub_match object.
   */
  template<typename _Bi_iter,
	   typename _Ch_type = typename iterator_traits<_Bi_iter>::value_type,
	   typename _Rx_traits = regex_traits<_Ch_type> >
    class regex_token_iterator
    {
    public:
      typedef basic_regex<_Ch_type, _Rx_traits>	regex_type;
      typedef sub_match<_Bi_iter>		value_type;
      typedef std::ptrdiff_t			difference_type;
      typedef const value_type*			pointer;
      typedef const value_type&			reference;
      typedef std::forward_iterator_tag		iterator_category;

public:
      /**
       * @brief Default constructs a %regex_token_iterator.
       *
       * A default-constructed %regex_token_iterator is a singular iterator
       * that will compare equal to the one-past-the-end value for any
       * iterator of the same type.
       */
      regex_token_iterator()
      : _M_position(), _M_subs(), _M_suffix(), _M_n(0), _M_result(nullptr),
      _M_has_m1(false)
      { }

/**
       * Constructs a %regex_token_iterator...
       * @param __a          [IN] The start of the text to search.
       * @param __b          [IN] One-past-the-end of the text to search.
       * @param __re         [IN] The regular expression to search for.
       * @param __submatch   [IN] Which submatch to return.  There are some
       *                        special values for this parameter:
       *                        - -1 each enumerated subexpression does NOT
       *                          match the regular expression (aka field
       *                          splitting)
       *                        - 0 the entire string matching the
       *                          subexpression is returned for each match
       *                          within the text.
       *                        - >0 enumerates only the indicated
       *                          subexpression from a match within the text.
       * @param __m          [IN] Policy flags for match rules.
       */
      regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re,
			   int __submatch = 0,
			   regex_constants::match_flag_type __m
			   = regex_constants::match_default)
      : _M_position(__a, __b, __re, __m), _M_subs(1, __submatch), _M_n(0)
      { _M_init(__a, __b); }

/**
       * Constructs a %regex_token_iterator...
       * @param __a          [IN] The start of the text to search.
       * @param __b          [IN] One-past-the-end of the text to search.
       * @param __re         [IN] The regular expression to search for.
       * @param __submatches [IN] A list of subexpressions to return for each
       *                          regular expression match within the text.
       * @param __m          [IN] Policy flags for match rules.
       */
      regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
			   const regex_type& __re,
			   const std::vector<int>& __submatches,
			   regex_constants::match_flag_type __m
			     = regex_constants::match_default)
      : _M_position(__a, __b, __re, __m), _M_subs(__submatches), _M_n(0)
      { _M_init(__a, __b); }

/**
       * Constructs a %regex_token_iterator...
       * @param __a          [IN] The start of the text to search.
       * @param __b          [IN] One-past-the-end of the text to search.
       * @param __re         [IN] The regular expression to search for.
       * @param __submatches [IN] A list of subexpressions to return for each
       *                          regular expression match within the text.
       * @param __m          [IN] Policy flags for match rules.
       */
      regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
			   const regex_type& __re,
			   initializer_list<int> __submatches,
			   regex_constants::match_flag_type __m
			     = regex_constants::match_default)
      : _M_position(__a, __b, __re, __m), _M_subs(__submatches), _M_n(0)
      { _M_init(__a, __b); }

/**
       * Constructs a %regex_token_iterator...
       * @param __a          [IN] The start of the text to search.
       * @param __b          [IN] One-past-the-end of the text to search.
       * @param __re         [IN] The regular expression to search for.
       * @param __submatches [IN] A list of subexpressions to return for each
       *                          regular expression match within the text.
       * @param __m          [IN] Policy flags for match rules.
       */
      template<std::size_t _Nm>
	regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
			     const regex_type& __re,
			     const int (&__submatches)[_Nm],
			     regex_constants::match_flag_type __m
			     = regex_constants::match_default)
      : _M_position(__a, __b, __re, __m),
      _M_subs(__submatches, __submatches + _Nm), _M_n(0)
      { _M_init(__a, __b); }

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2332. regex_token_iterator should forbid temporary regexes
      regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&, int = 0,
			   regex_constants::match_flag_type =
			   regex_constants::match_default) = delete;
      regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&,
			   const std::vector<int>&,
			   regex_constants::match_flag_type =
			   regex_constants::match_default) = delete;
      regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&,
			   initializer_list<int>,
			   regex_constants::match_flag_type =
			   regex_constants::match_default) = delete;
      template <std::size_t _Nm>
	regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&,
			     const int (&)[_Nm],
			     regex_constants::match_flag_type =
			     regex_constants::match_default) = delete;

/**
       * @brief Copy constructs a %regex_token_iterator.
       * @param __rhs [IN] A %regex_token_iterator to copy.
       */
      regex_token_iterator(const regex_token_iterator& __rhs)
      : _M_position(__rhs._M_position), _M_subs(__rhs._M_subs),
      _M_suffix(__rhs._M_suffix), _M_n(__rhs._M_n), _M_has_m1(__rhs._M_has_m1)
      { _M_normalize_result(); }

/**
       * @brief Assigns a %regex_token_iterator to another.
       * @param __rhs [IN] A %regex_token_iterator to copy.
       */
      regex_token_iterator&
      operator=(const regex_token_iterator& __rhs);

/**
       * @brief Compares a %regex_token_iterator to another for equality.
       */
      bool
      operator==(const regex_token_iterator& __rhs) const;

/**
       * @brief Compares a %regex_token_iterator to another for inequality.
       */
      bool
      operator!=(const regex_token_iterator& __rhs) const
      { return !(*this == __rhs); }

/**
       * @brief Dereferences a %regex_token_iterator.
       */
      const value_type&
      operator*() const
      { return *_M_result; }

/**
       * @brief Selects a %regex_token_iterator member.
       */
      const value_type*
      operator->() const
      { return _M_result; }

/**
       * @brief Increments a %regex_token_iterator.
       */
      regex_token_iterator&
      operator++();

/**
       * @brief Postincrements a %regex_token_iterator.
       */
      regex_token_iterator
      operator++(int)
      {
	auto __tmp = *this;
	++(*this);
	return __tmp;
      }

private:
      typedef regex_iterator<_Bi_iter, _Ch_type, _Rx_traits> _Position;

void
      _M_init(_Bi_iter __a, _Bi_iter __b);

const value_type&
      _M_current_match() const
      {
	if (_M_subs[_M_n] == -1)
	  return (*_M_position).prefix();
	else
	  return (*_M_position)[_M_subs[_M_n]];
      }

constexpr bool
      _M_end_of_seq() const
      { return _M_result == nullptr; }

// [28.12.2.2.4]
      void
      _M_normalize_result()
      {
	if (_M_position != _Position())
	  _M_result = &_M_current_match();
	else if (_M_has_m1)
	  _M_result = &_M_suffix;
	else
	  _M_result = nullptr;
      }

_Position		_M_position;
      std::vector<int>	_M_subs;
      value_type	_M_suffix;
      std::size_t	_M_n;
      const value_type*	_M_result;

// Show whether _M_subs contains -1
      bool		_M_has_m1;
    };

/** @brief Token iterator for C-style NULL-terminated strings. */
  typedef regex_token_iterator<const char*>		cregex_token_iterator;

/** @brief Token iterator for standard strings. */
  typedef regex_token_iterator<string::const_iterator>	sregex_token_iterator;

#ifdef _GLIBCXX_USE_WCHAR_T
  /** @brief Token iterator for C-style NULL-terminated wide strings. */
  typedef regex_token_iterator<const wchar_t*>		wcregex_token_iterator;

/** @brief Token iterator for standard wide-character strings. */
  typedef regex_token_iterator<wstring::const_iterator> wsregex_token_iterator;
#endif

//@} // group regex

_GLIBCXX_END_NAMESPACE_CXX11
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#include <bits/regex.tcc>

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