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標準ライブラリヘッダ <regex>

提供: cppreference.com
< cpp‎ | header
 
C++
 
標準ライブラリヘッダ
言語サポート
コンセプト
<concepts>
診断
汎用ユーティリティ
文字列
ローカライゼーション
コンテナ
イテレータ
<iterator>
範囲
<ranges>
アルゴリズム
数値演算
入出力
正規表現
<regex>
ファイルシステムサポート
<filesystem>
スレッドサポート
C互換
 

このヘッダは正規表現ライブラリの一部です。

目次

インクルード

(C++20)
 三方比較演算子サポート [edit]
(C++11)
 std::initializer_list クラステンプレート [edit]

クラス

(C++11)
 正規表現オブジェクト
(クラステンプレート) [edit]
(C++11)
 部分表現によってマッチされた文字シーケンスを識別します
(クラステンプレート) [edit]
(C++11)
 すべての部分表現のマッチを含む1つの正規表現マッチを識別します
(クラステンプレート) [edit]
(C++11)
 文字シーケンス中のすべての正規表現マッチをイテレートします
(クラステンプレート) [edit]
(C++11)
 指定された文字列中のすべての正規表現マッチ内の指定された部分表現またはマッチしなかった部分文字列をイテレートします
(クラステンプレート) [edit]
(C++11)
 正規表現ライブラリによって生成されたエラーを報告します
(クラス) [edit]
(C++11)
 正規表現ライブラリによって要求される文字型に関するメタ情報を提供します
(クラステンプレート) [edit]
regex の定数型
名前空間 std::regex_constants で定義
(C++11)
 正規表現の動作を制御する一般的なオプション
(typedef) [edit]
(C++11)
 マッチングに固有のオプション
(typedef) [edit]
(C++11)
 様々な種類のマッチングエラーを表します
(typedef) [edit]

関数

アルゴリズム
(C++11)
 文字シーケンス全体への正規表現のマッチを試みます
(関数テンプレート) [edit]
(C++11)
 文字シーケンスの任意の部分への正規表現のマッチを試みます
(関数テンプレート) [edit]
(C++11)
 正規表現の現れた部分を書式化された置換テキストに置き換えます
(関数テンプレート) [edit]
非メンバ操作
(C++11)
 std::swap アルゴリズムの特殊化
(関数テンプレート) [edit]
(C++20で削除)(C++20で削除)(C++20で削除)(C++20で削除)(C++20で削除)(C++20)
 sub_match を別の sub_match、文字列、または文字と比較します
(関数テンプレート) [edit]
マッチした文字部分シーケンスを出力します
(関数テンプレート) [edit]
(C++20で削除)
 2つのマッチ結果内の値を辞書的に比較します
(関数テンプレート) [edit]
(C++11)
 std::swap アルゴリズムの特殊化
(関数テンプレート) [edit]
範囲アクセス
(C++11)(C++14)
 コンテナまたは配列の先頭を指すイテレータを返します
(関数) [edit]
(C++11)(C++14)
 コンテナまたは配列の終端を指すイテレータを返します
(関数) [edit]
(C++14)
 コンテナまたは配列の先頭を指す逆イテレータを返します
(関数) [edit]
(C++14)
 コンテナまたは配列の終端を指す逆イテレータを返します
(関数) [edit]
(C++17)(C++20)
 コンテナまたは配列のサイズを返します
(関数テンプレート) [edit]
(C++17)
 コンテナが空かどうか調べます
(関数) [edit]
(C++17)
 ベースとなる配列を指すポインタを取得します
(関数) [edit]

[編集] 概要

#include <compare>
#include <initializer_list>
 
namespace std {
  // regex constants
  namespace regex_constants {
    using syntax_option_type = /*T1*/;
    using match_flag_type = /*T2*/;
    using error_type = /*T3*/;
  }
 
  // class regex_­error
  class regex_error;
 
  // class template regex_traits
  template<class CharT> struct regex_traits;
 
  // class template 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 swap
  template<class CharT, class Traits>
    void swap(basic_regex<CharT, Traits>& e1, basic_regex<CharT, Traits>& e2);
 
  // class template 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 non-member operators
  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);
 
  // class template 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 comparisons
  template<class BiIt, class Allocator>
    bool operator==(const match_results<BiIt, Allocator>& m1,
                    const match_results<BiIt, Allocator>& m2);
 
  // match_­results swap
  template<class BiIt, class Allocator>
    void swap(match_results<BiIt, Allocator>& m1, match_results<BiIt, Allocator>& m2);
 
  // function template regex_­match
  template<class BiIt, class Allocator, class CharT, class Traits>
    bool regex_match(BiIt first, BiIt last,
                     match_results<BiIt, Allocator>& m,
                     const basic_regex<CharT, Traits>& e,
                     regex_constants::match_flag_type flags =
                       regex_constants::match_default);
  template<class BiIt, class CharT, class Traits>
    bool regex_match(BiIt first, BiIt last,
                     const basic_regex<CharT, Traits>& e,
                     regex_constants::match_flag_type flags =
                       regex_constants::match_default);
  template<class CharT, class Allocator, class Traits>
    bool regex_match(const CharT* str, match_results<const CharT*, Allocator>& m,
                     const basic_regex<CharT, Traits>& e,
                     regex_constants::match_flag_type flags =
                       regex_constants::match_default);
  template<class ST, class SA, class Allocator, class CharT, class Traits>
    bool regex_match(const basic_string<CharT, ST, SA>& s,
                     match_results<typename basic_string<CharT, ST, SA>::const_iterator,
                                   Allocator>& m,
                     const basic_regex<CharT, Traits>& e,
                     regex_constants::match_flag_type flags =
                       regex_constants::match_default);
  template<class ST, class SA, class Allocator, class CharT, class Traits>
    bool regex_match(const basic_string<CharT, ST, SA>&&,
                     match_results<typename basic_string<CharT, ST, SA>::const_iterator,
                                   Allocator>&,
                     const basic_regex<CharT, Traits>&,
                     regex_constants::match_flag_type =
                       regex_constants::match_default) = delete;
  template<class CharT, class Traits>
    bool regex_match(const CharT* str,
                     const basic_regex<CharT, Traits>& e,
                     regex_constants::match_flag_type flags =
                       regex_constants::match_default);
  template<class ST, class SA, class CharT, class Traits>
    bool regex_match(const basic_string<CharT, ST, SA>& s,
                     const basic_regex<CharT, Traits>& e,
                     regex_constants::match_flag_type flags =
                       regex_constants::match_default);
 
  // function template regex_­search
  template<class BiIt, class Allocator, class CharT, class Traits>
    bool regex_search(BiIt first, BiIt last,
                      match_results<BiIt, Allocator>& m,
                      const basic_regex<CharT, Traits>& e,
                      regex_constants::match_flag_type flags =
                        regex_constants::match_default);
  template<class BiIt, class CharT, class Traits>
    bool regex_search(BiItfirst, BiIt last,
                      const basic_regex<CharT, Traits>& e,
                      regex_constants::match_flag_type flags =
                        regex_constants::match_default);
  template<class CharT, class Allocator, class Traits>
    bool regex_search(const CharT* str,
                      match_results<const CharT*, Allocator>& m,
                      const basic_regex<CharT, Traits>& e,
                      regex_constants::match_flag_type flags =
                        regex_constants::match_default);
  template<class CharT, class Traits>
    bool regex_search(const CharT* str,
                      const basic_regex<CharT, Traits>& e,
                      regex_constants::match_flag_type flags =
                        regex_constants::match_default);
  template<class ST, class SA, class CharT, class Traits>
    bool regex_search(const basic_string<CharT, ST, SA>& s,
                      const basic_regex<CharT, Traits>& e,
                      regex_constants::match_flag_type flags =
                        regex_constants::match_default);
  template<class ST, class SA, class Allocator, class CharT, class Traits>
    bool regex_search(const basic_string<CharT, ST, SA>& s,
                      match_results<typename basic_string<CharT, ST, SA>::const_iterator,
                                    Allocator>& m,
                      const basic_regex<CharT, Traits>& e,
                      regex_constants::match_flag_type flags =
                        regex_constants::match_default);
  template<class ST, class SA, class Allocator, class CharT, class Traits>
    bool regex_search(const basic_string<CharT, ST, SA>&&,
                      match_results<typename basic_string<CharT, ST, SA>::const_iterator,
                                    Allocator>&,
                      const basic_regex<CharT, Traits>&,
                      regex_constants::match_flag_type
                        = regex_constants::match_default) = delete;
 
  // function template regex_­replace
  template<class OutputIt, class BiIt,
            class Traits, class CharT, class ST, class SA>
    OutputIt
      regex_replace(OutputIt out,
                    BiIt first, BiIt last,
                    const basic_regex<CharT, Traits>& e,
                    const basic_string<CharT, ST, SA>& fmt,
                    regex_constants::match_flag_type flags =
                      regex_constants::match_default);
  template<class OutputIt, class BiIt, class Traits, class CharT>
    OutputIt
      regex_replace(OutputIt out,
                    BiIt first, BiIt last,
                    const basic_regex<CharT, Traits>& e,
                    const CharT* fmt,
                    regex_constants::match_flag_type flags =
                      regex_constants::match_default);
  template<class Traits, class CharT, class ST, class SA, class FST, class FSA>
    basic_string<CharT, ST, SA>
      regex_replace(const basic_string<CharT, ST, SA>& s,
                    const basic_regex<CharT, Traits>& e,
                    const basic_string<CharT, FST, FSA>& fmt,
                    regex_constants::match_flag_type flags =
                      regex_constants::match_default);
  template<class Traits, class CharT, class ST, class SA>
    basic_string<CharT, ST, SA>
      regex_replace(const basic_string<CharT, ST, SA>& s,
                    const basic_regex<CharT, Traits>& e,
                    const CharT* fmt,
                    regex_constants::match_flag_type flags =
                      regex_constants::match_default);
  template<class Traits, class CharT, class ST, class SA>
    basic_string<CharT>
      regex_replace(const CharT* s,
                    const basic_regex<CharT, Traits>& e,
                    const basic_string<CharT, ST, SA>& fmt,
                    regex_constants::match_flag_type flags =
                      regex_constants::match_default);
  template<class Traits, class CharT>
    basic_string<CharT>
      regex_replace(const CharT* s,
                    const basic_regex<CharT, Traits>& e,
                    const CharT* fmt,
                    regex_constants::match_flag_type flags =
                      regex_constants::match_default);
 
  // class template regex_­iterator
  template<class BiIt,
            class CharT = typename iterator_traits<BiIt>::value_type,
            class Traits = regex_traits<CharT>>
    class regex_iterator;
 
  using cregex_iterator  = regex_iterator<const char*>;
  using wcregex_iterator = regex_iterator<const wchar_t*>;
  using sregex_iterator  = regex_iterator<string::const_iterator>;
  using wsregex_iterator = regex_iterator<wstring::const_iterator>;
 
  // class template regex_­token_­iterator
  template<class BiIt,
            class CharT = typename iterator_traits<BiIt>::value_type,
            class Traits = regex_traits<CharT>>
    class regex_token_iterator;
 
  using cregex_token_iterator  = regex_token_iterator<const char*>;
  using wcregex_token_iterator = regex_token_iterator<const wchar_t*>;
  using sregex_token_iterator  = regex_token_iterator<string::const_iterator>;
  using wsregex_token_iterator = regex_token_iterator<wstring::const_iterator>;
 
  namespace pmr {
    template<class BiIt>
      using match_results =
        std::match_results<BiIt, polymorphic_allocator<sub_match<BiIt>>>;
 
    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>;
  }
}

[編集] ビットマスク型 std::regex_constants::syntax_option_type

namespace std::regex_constants {
  using syntax_option_type = /*T1*/;
  inline constexpr syntax_option_type icase = /* unspecified */;
  inline constexpr syntax_option_type nosubs = /* unspecified */;
  inline constexpr syntax_option_type optimize = /* unspecified */;
  inline constexpr syntax_option_type collate = /* unspecified */;
  inline constexpr syntax_option_type ECMAScript = /* unspecified */;
  inline constexpr syntax_option_type basic = /* unspecified */;
  inline constexpr syntax_option_type extended = /* unspecified */;
  inline constexpr syntax_option_type awk = /* unspecified */;
  inline constexpr syntax_option_type grep = /* unspecified */;
  inline constexpr syntax_option_type egrep = /* unspecified */;
  inline constexpr syntax_option_type multiline = /* unspecified */;
}

[編集] ビットマスク型 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 = /* unspecified */;
  inline constexpr match_flag_type match_­not_­eol = /* unspecified */;
  inline constexpr match_flag_type match_­not_­bow = /* unspecified */;
  inline constexpr match_flag_type match_­not_­eow = /* unspecified */;
  inline constexpr match_flag_type match_­any = /* unspecified */;
  inline constexpr match_flag_type match_­not_­null = /* unspecified */;
  inline constexpr match_flag_type match_­continuous = /* unspecified */;
  inline constexpr match_flag_type match_­prev_­avail = /* unspecified */;
  inline constexpr match_flag_type format_­default = {};
  inline constexpr match_flag_type format_­sed = /* unspecified */;
  inline constexpr match_flag_type format_­no_­copy = /* unspecified */;
  inline constexpr match_flag_type format_­first_­only = /* unspecified */;
}

[編集] 列挙型 std::regex_constants::error_type

namespace std::regex_constants {
  using error_type = /*T3*/;
  inline constexpr error_type error_collate = /* unspecified */;
  inline constexpr error_type error_ctype = /* unspecified */;
  inline constexpr error_type error_escape = /* unspecified */;
  inline constexpr error_type error_backref = /* unspecified */;
  inline constexpr error_type error_brack = /* unspecified */;
  inline constexpr error_type error_paren = /* unspecified */;
  inline constexpr error_type error_brace = /* unspecified */;
  inline constexpr error_type error_badbrace = /* unspecified */;
  inline constexpr error_type error_range = /* unspecified */;
  inline constexpr error_type error_space = /* unspecified */;
  inline constexpr error_type error_badrepeat = /* unspecified */;
  inline constexpr error_type error_complexity = /* unspecified */;
  inline constexpr error_type error_stack = /* unspecified */;
}

[編集] クラス 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;
  };
}

[編集] クラステンプレート 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 = /* bitmask_type */;
 
      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;
    };
}

[編集] クラステンプレート std::basic_regex

namespace std {
  template<class CharT, class Traits = regex_traits<CharT>>
    class basic_regex {
    public:
      // types
      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;
 
      // constants
      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;
 
      // construct/copy/destroy
      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();
 
      // assign
      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);
 
      // const operations
      unsigned mark_count() const;
      flag_type flags() const;
 
      // locale
      locale_type imbue(locale_type loc);
      locale_type getloc() const;
 
      // swap
      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>;
}

[編集] クラステンプレート 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;
    };
}

[編集] クラステンプレート 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  = /* implementation-defined */;
      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>;
 
      // construct/copy/destroy
      match_results() : match_results(Allocator()) {}
      explicit match_results(const Allocator&);
      match_results(const match_results& m);
      match_results(match_results&& m) noexcept;
      match_results& operator=(const match_results& m);
      match_results& operator=(match_results&& m);
      ~match_results();
 
      // state
      bool ready() const;
 
      // size
      size_type size() const;
      size_type max_size() const;
      [[nodiscard]] bool empty() const;
 
      // element access
      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;
 
      // format
      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;
 
      // allocator
      allocator_type get_allocator() const;
 
      // swap
      void swap(match_results& that);
    };
}
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