Standard library header <regex> (C++11)
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此头文件属于 文本处理 库。
包含头文件 |
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(C++20)
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三路比较运算符 支持 | |
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(C++11)
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std::initializer_list 类模板 | |
类 |
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(C++11)
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正则表达式对象
(类模板) |
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| std::regex | std:: basic_regex < char > (类型别名) | |
| std::wregex | std:: basic_regex < wchar_t > (类型别名) | |
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(C++11)
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标识子表达式匹配的字符序列
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| std::csub_match | std:: sub_match < const char * > (类型别名) | |
| std::wcsub_match | std:: sub_match < const wchar_t * > (类型别名) | |
| std::ssub_match | std:: sub_match < std :: string :: const_iterator > (类型别名) | |
| std::wssub_match | std:: sub_match < std :: wstring :: const_iterator > (类型别名) | |
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(C++11)
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标识一个正则表达式匹配，包括所有子表达式匹配
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| std::cmatch | std:: match_results < const char * > (类型别名) | |
| std::wcmatch | std:: match_results < const wchar_t * > (类型别名) | |
| std::smatch | std:: match_results < std :: string :: const_iterator > (类型别名) | |
| std::wsmatch | std:: match_results < std :: wstring :: const_iterator > (类型别名) | |
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(C++11)
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遍历字符序列中的所有正则表达式匹配
(类模板) |
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| std::cregex_iterator | std:: regex_iterator < <span | |
概要
#include <compare> #include <initializer_list> namespace std { // 正则表达式常量 namespace regex_constants { using syntax_option_type = /*T1*/; using match_flag_type = /*T2*/; using error_type = /*T3*/; } // 类 regex_error class regex_error; // 类模板 regex_traits template<class CharT> struct regex_traits; // 类模板 basic_regex template<class CharT, class Traits = regex_traits<CharT>> class basic_regex; using regex = basic_regex<char>; using wregex = basic_regex<wchar_t>; // basic_regex 交换函数 template<class CharT, class Traits> void swap(basic_regex<CharT, Traits>& e1, basic_regex<CharT, Traits>& e2); // 类模板 sub_match template<class BiIt> class sub_match; using csub_match = sub_match<const char*>; using wcsub_match = sub_match<const wchar_t*>; using ssub_match = sub_match<string::const_iterator>; using wssub_match = sub_match<wstring::const_iterator>; // sub_match 非成员运算符 template<class BiIt> bool operator==(const sub_match<BiIt>& lhs, const sub_match<BiIt>& rhs); template<class BiIt> auto operator<=>(const sub_match<BiIt>& lhs, const sub_match<BiIt>& rhs); template<class BiIt, class ST, class SA> bool operator==( const sub_match<BiIt>& lhs, const basic_string<typename iterator_traits<BiIt>::value_type, ST, SA>& rhs); template<class BiIt, class ST, class SA> auto operator<=>( const sub_match<BiIt>& lhs, const basic_string<typename iterator_traits<BiIt>::value_type, ST, SA>& rhs); template<class BiIt> bool operator==(const sub_match<BiIt>& lhs, const typename iterator_traits<BiIt>::value_type* rhs); template<class BiIt> auto operator<=>(const sub_match<BiIt>& lhs, const typename iterator_traits<BiIt>::value_type* rhs); template<class BiIt> bool operator==(const sub_match<BiIt>& lhs, const typename iterator_traits<BiIt>::value_type& rhs); template<class BiIt> auto operator<=>(const sub_match<BiIt>& lhs, const typename iterator_traits<BiIt>::value_type& rhs); template<class CharT, class ST, class BiIt> basic_ostream<CharT, ST>& operator<<(basic_ostream<CharT, ST>& os, const sub_match<BiIt>& m); // 类模板 match_results template<class BiIt, class Allocator = allocator<sub_match<BiIt>>> class match_results; using cmatch = match_results<const char*>; using wcmatch = match_results<const wchar_t*>; using smatch = match_results<string::const_iterator>; using wsmatch = match_results<wstring::const_iterator>; // match_results 比较操作 template<class BiIt, class Allocator> bool operator==(const match_results<BiIt, Allocator>& m1, const match_results<BiIt, Allocator>& m2); <
位掩码类型 std::regex_constants::syntax_option_type
namespace std::regex_constants { using syntax_option_type = /*T1*/; inline constexpr syntax_option_type icase = /* 未指定 */; inline constexpr syntax_option_type nosubs = /* 未指定 */; inline constexpr syntax_option_type optimize = /* 未指定 */; inline constexpr syntax_option_type collate = /* 未指定 */; inline constexpr syntax_option_type ECMAScript = /* 未指定 */; inline constexpr syntax_option_type basic = /* 未指定 */; inline constexpr syntax_option_type extended = /* 未指定 */; inline constexpr syntax_option_type awk = /* 未指定 */; inline constexpr syntax_option_type grep = /* 未指定 */; inline constexpr syntax_option_type egrep = /* 未指定 */; inline constexpr syntax_option_type multiline = /* 未指定 */; }
位掩码类型 std::regex_constants::match_flag_type
namespace std::regex_constants { using match_flag_type = /*T2*/; inline constexpr match_flag_type match_default = {}; inline constexpr match_flag_type match_not_bol = /* 未指定 */; inline constexpr match_flag_type match_not_eol = /* 未指定 */; inline constexpr match_flag_type match_not_bow = /* 未指定 */; inline constexpr match_flag_type match_not_eow = /* 未指定 */; inline constexpr match_flag_type match_any = /* 未指定 */; inline constexpr match_flag_type match_not_null = /* 未指定 */; inline constexpr match_flag_type match_continuous = /* 未指定 */; inline constexpr match_flag_type match_prev_avail = /* 未指定 */; inline constexpr match_flag_type format_default = {}; inline constexpr match_flag_type format_sed = /* 未指定 */; inline constexpr match_flag_type format_no_copy = /* 未指定 */; inline constexpr match_flag_type format_first_only = /* 未指定 */; }
枚举类型 std::regex_constants::error_type
namespace std::regex_constants { using error_type = /*T3*/; inline constexpr error_type error_collate = /* 未指定 */; inline constexpr error_type error_ctype = /* 未指定 */; inline constexpr error_type error_escape = /* 未指定 */; inline constexpr error_type error_backref = /* 未指定 */; inline constexpr error_type error_brack = /* 未指定 */; inline constexpr error_type error_paren = /* 未指定 */; inline constexpr error_type error_brace = /* 未指定 */; inline constexpr error_type error_badbrace = /* 未指定 */; inline constexpr error_type error_range = /* 未指定 */; inline constexpr error_type error_space = /* 未指定 */; inline constexpr error_type error_badrepeat = /* 未指定 */; inline constexpr error_type error_complexity = /* 未指定 */; inline constexpr error_type error_stack = /* 未指定 */; }
类 std::regex_error
namespace std { class regex_error : public runtime_error { public: explicit regex_error(regex_constants::error_type ecode); regex_constants::error_type code() const; }; }
类模板 std::regex_traits
namespace std { template<class CharT> struct regex_traits { using char_type = CharT; using string_type = basic_string<char_type>; using locale_type = locale; using char_class_type = /* 位掩码类型 */; regex_traits(); static size_t length(const char_type* p); CharT translate(CharT c) const; CharT translate_nocase(CharT c) const; template<class ForwardIt> string_type transform(ForwardIt first, ForwardIt last) const; template<class ForwardIt> string_type transform_primary(ForwardIt first, ForwardIt last) const; template<class ForwardIt> string_type lookup_collatename(ForwardIt first, ForwardIt last) const; template<class ForwardIt> char_class_type lookup_classname(ForwardIt first, ForwardIt last, bool icase = false) const; bool isctype(CharT c, char_class_type f) const; int value(CharT ch, int radix) const; locale_type imbue(locale_type l); locale_type getloc() const; }; }
类模板 std::basic_regex
namespace std { template<class CharT, class Traits = regex_traits<CharT>> class basic_regex { public: // 类型定义 using value_type = CharT; using Traits_type = Traits; using string_type = typename Traits::string_type; using flag_type = regex_constants::syntax_option_type; using locale_type = typename Traits::locale_type; // 常量 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; static constexpr flag_type multiline = regex_constants::multiline; // 构造/复制/销毁 basic_regex(); explicit basic_regex(const CharT* p, flag_type f = regex_constants::ECMAScript); basic_regex(const CharT* p, size_t len, flag_type f = regex_constants::ECMAScript); basic_regex(const basic_regex&); basic_regex(basic_regex&&) noexcept; template<class ST, class SA> explicit basic_regex(const basic_string<CharT, ST, SA>& s, flag_type f = regex_constants::ECMAScript); template<class ForwardIt> basic_regex(ForwardIt first, ForwardIt last, flag_type f = regex_constants::ECMAScript); basic_regex(initializer_list<CharT> il, flag_type f = regex_constants::ECMAScript); ~basic_regex(); // 赋值 basic_regex& operator=(const basic_regex& e); basic_regex& operator=(basic_regex&& e) noexcept; basic_regex& operator=(const CharT* p); basic_regex& operator=(initializer_list<CharT> il); template<class ST, class SA> basic_regex& operator=(const basic_string<CharT, ST, SA>& s); basic_regex& assign(const basic_regex& e); basic_regex& assign(basic_regex&& e) noexcept; basic_regex& assign(const CharT* p, flag_type f = regex_constants::ECMAScript); basic_regex& assign(const CharT* p, size_t len, flag_type f = regex_constants::ECMAScript); template<class ST, class SA> basic_regex& assign(const basic_string<CharT, ST, SA>& s, flag_type f = regex_constants::ECMAScript); template<class InputIt> basic_regex& assign(InputIt first, InputIt last, flag_type f = regex_constants::ECMAScript); basic_regex& assign(initializer_list<CharT>, flag_type f = regex_constants::ECMAScript); // 常量操作 unsigned mark_count() const; flag_type flags() const; // 区域设置 locale_type imbue(locale_type loc); locale_type getloc() const; // 交换 void swap(basic_regex&); }; template<class ForwardIt> basic_regex(ForwardIt, ForwardIt, regex_constants::syntax_option_type = regex_constants::ECMAScript) -> basic_regex<typename iterator_traits<ForwardIt>::value_type>; }
类模板 std::sub_match
namespace std { template<class BiIt> class sub_match : public pair<BiIt, BiIt> { public: using value_type = typename iterator_traits<BiIt>::value_type; using difference_type = typename iterator_traits<BiIt>::difference_type; using iterator = BiIt; using string_type = basic_string<value_type>; bool matched; constexpr sub_match(); difference_type length() const; operator string_type() const; string_type str() const; int compare(const sub_match& s) const; int compare(const string_type& s) const; int compare(const value_type* s) const; void swap(sub_match& s) noexcept(/* 详见描述 */); }; }
类模板 std::match_results
namespace std { template<class BiIt, class Allocator = allocator<sub_match<BiIt>>> class match_results { public: using value_type = sub_match<BiIt>; using const_reference = const value_type&; using reference = value_type&; using const_iterator = /* 实现定义 */; using iterator = const_iterator; using difference_type = typename iterator_traits<BiIt>::difference_type; using size_type = typename allocator_traits<Allocator>::size_type; using allocator_type = Allocator; using char_type = typename iterator_traits<BiIt>::value_type; using string_type = basic_string<char_type>; // 构造/复制/销毁 match_results() : match_results(Allocator()) {} explicit match_results(const Allocator& a); match_results(const match_results& m); match_results(const match_results& m, const Allocator& a); match_results(match_results&& m) noexcept; match_results(match_results&& m, const Allocator& a); match_results& operator=(const match_results& m); match_results& operator=(match_results&& m); ~match_results(); // 状态 bool ready() const; // 大小 size_type size() const; size_type max_size() const; bool empty() const; // 元素访问 difference_type length(size_type sub = 0) const; difference_type position(size_type sub = 0) const; string_type str(size_type sub = 0) const; const_reference operator[](size_type n) const; const_reference prefix() const; const_reference suffix() const; const_iterator begin() const; const_iterator end() const; const_iterator cbegin() const; const_iterator cend() const; // 格式化 template<class OutputIt> OutputIt format(OutputIt out, const char_type* fmt_first, const char_type* fmt_last, regex_constants::match_flag_type flags = regex_constants::format_default) const; template<class OutputIt, class ST, class SA> OutputIt format(OutputIt out, const basic_string<char_type, ST, SA>& fmt, regex_constants::match_flag_type flags = regex_constants::format_default) const; template<class ST, class SA> basic_string<char_type, ST, SA> format(const basic_string<char_type, ST, SA>& fmt, regex_constants::match_flag_type flags = regex_constants::format_default) const; string_type format(const char_type* fmt, regex_constants::match_flag_type flags = regex_constants::format_default) const; // 分配器 allocator_type get_allocator() const; // 交换 void swap(match_results& that); }; }