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Code Editor : regex_constants.h

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

// Copyright (C) 2010-2013 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_constants.h
 *  @brief Constant definitions for the std regex library.
 *
 *  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)
{
/**
 * @defgroup regex Regular Expressions
 *
 * A facility for performing regular expression pattern matching.
 * @{
 */

/**
 * @namespace std::regex_constants
 * @brief ISO C++-0x entities sub namespace for regex.
 */
namespace regex_constants
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/**
   * @name 5.1 Regular Expression Syntax Options
   */
  //@{
  enum __syntax_option
    {
      _S_icase,
      _S_nosubs,
      _S_optimize,
      _S_collate,
      _S_ECMAScript,
      _S_basic,
      _S_extended,
      _S_awk,
      _S_grep,
      _S_egrep,
      _S_syntax_last
    };

/**
   * @brief This is a bitmask type indicating how to interpret the regex.
   *
   * The @c syntax_option_type is implementation defined but it is valid to
   * perform bitwise operations on these values and expect the right thing to
   * happen.
   *
   * A valid value of type syntax_option_type shall have exactly one of the
   * elements @c ECMAScript, @c basic, @c extended, @c awk, @c grep, @c egrep
   * %set.
   */
  typedef unsigned int syntax_option_type;

/** 
   * Specifies that the matching of regular expressions against a character
   * sequence shall be performed without regard to case.
   */
  constexpr syntax_option_type icase      = 1 << _S_icase;

/**
   * Specifies that when a regular expression is matched against a character
   * container sequence, no sub-expression matches are to be stored in the
   * supplied match_results structure.
   */
  constexpr syntax_option_type nosubs     = 1 << _S_nosubs;

/**
   * Specifies that the regular expression engine should pay more attention to
   * the speed with which regular expressions are matched, and less to the
   * speed with which regular expression objects are constructed. Otherwise
   * it has no detectable effect on the program output.
   */
  constexpr syntax_option_type optimize   = 1 << _S_optimize;

/**
   * Specifies that character ranges of the form [a-b] should be locale
   * sensitive.
   */
  constexpr syntax_option_type collate    = 1 << _S_collate;

/**
   * Specifies that the grammar recognized by the regular expression engine is
   * that used by ECMAScript in ECMA-262 [Ecma International, ECMAScript
   * Language Specification, Standard Ecma-262, third edition, 1999], as
   * modified in section [28.13].  This grammar is similar to that defined
   * in the PERL scripting language but extended with elements found in the
   * POSIX regular expression grammar.
   */
  constexpr syntax_option_type ECMAScript = 1 << _S_ECMAScript;

/**
   * Specifies that the grammar recognized by the regular expression engine is
   * that used by POSIX basic regular expressions in IEEE Std 1003.1-2001,
   * Portable Operating System Interface (POSIX), Base Definitions and
   * Headers, Section 9, Regular Expressions [IEEE, Information Technology --
   * Portable Operating System Interface (POSIX), IEEE Standard 1003.1-2001].
   */
  constexpr syntax_option_type basic      = 1 << _S_basic;

/**
   * Specifies that the grammar recognized by the regular expression engine is
   * that used by POSIX extended regular expressions in IEEE Std 1003.1-2001,
   * Portable Operating System Interface (POSIX), Base Definitions and Headers,
   * Section 9, Regular Expressions.
   */
  constexpr syntax_option_type extended   = 1 << _S_extended;

/**
   * Specifies that the grammar recognized by the regular expression engine is
   * that used by POSIX utility awk in IEEE Std 1003.1-2001.  This option is
   * identical to syntax_option_type extended, except that C-style escape
   * sequences are supported.  These sequences are:
   * \\\\, \\a, \\b, \\f, \\n, \\r, \\t , \\v, \\&apos;, &apos;,
   * and \\ddd (where ddd is one, two, or three octal digits).  
   */
  constexpr syntax_option_type awk        = 1 << _S_awk;

/**
   * Specifies that the grammar recognized by the regular expression engine is
   * that used by POSIX utility grep in IEEE Std 1003.1-2001.  This option is
   * identical to syntax_option_type basic, except that newlines are treated
   * as whitespace.
   */
  constexpr syntax_option_type grep       = 1 << _S_grep;

/**
   * Specifies that the grammar recognized by the regular expression engine is
   * that used by POSIX utility grep when given the -E option in
   * IEEE Std 1003.1-2001.  This option is identical to syntax_option_type 
   * extended, except that newlines are treated as whitespace.
   */
  constexpr syntax_option_type egrep      = 1 << _S_egrep;

//@}

/**
   * @name 5.2 Matching Rules
   *
   * Matching a regular expression against a sequence of characters [first,
   * last) proceeds according to the rules of the grammar specified for the
   * regular expression object, modified according to the effects listed
   * below for any bitmask elements set.
   *
   */
  //@{

enum __match_flag
    {
      _S_not_bol,
      _S_not_eol,
      _S_not_bow,
      _S_not_eow,
      _S_any,
      _S_not_null,
      _S_continuous,
      _S_prev_avail,
      _S_sed,
      _S_no_copy,
      _S_first_only,
      _S_match_flag_last
    };

/**
   * @brief This is a bitmask type indicating regex matching rules.
   *
   * The @c match_flag_type is implementation defined but it is valid to
   * perform bitwise operations on these values and expect the right thing to
   * happen.
   */
  typedef std::bitset<_S_match_flag_last> match_flag_type;

/**
   * The default matching rules.
   */
  constexpr match_flag_type match_default     = 0;

/**
   * The first character in the sequence [first, last) is treated as though it
   * is not at the beginning of a line, so the character (^) in the regular
   * expression shall not match [first, first).
   */
  constexpr match_flag_type match_not_bol     = 1 << _S_not_bol;

/**
   * The last character in the sequence [first, last) is treated as though it
   * is not at the end of a line, so the character ($) in the regular
   * expression shall not match [last, last).
   */
  constexpr match_flag_type match_not_eol     = 1 << _S_not_eol;
   
  /**
   * The expression \\b is not matched against the sub-sequence
   * [first,first).
   */
  constexpr match_flag_type match_not_bow     = 1 << _S_not_bow;
   
  /**
   * The expression \\b should not be matched against the sub-sequence
   * [last,last).
   */
  constexpr match_flag_type match_not_eow     = 1 << _S_not_eow;
   
  /**
   * If more than one match is possible then any match is an acceptable
   * result.
   */
  constexpr match_flag_type match_any         = 1 << _S_any;
   
  /**
   * The expression does not match an empty sequence.
   */
  constexpr match_flag_type match_not_null    = 1 << _S_not_null;
   
  /**
   * The expression only matches a sub-sequence that begins at first .
   */
  constexpr match_flag_type match_continuous  = 1 << _S_continuous;
   
  /**
   * --first is a valid iterator position.  When this flag is set then the
   * flags match_not_bol and match_not_bow are ignored by the regular
   * expression algorithms 28.11 and iterators 28.12.
   */
  constexpr match_flag_type match_prev_avail  = 1 << _S_prev_avail;

/**
   * When a regular expression match is to be replaced by a new string, the
   * new string is constructed using the rules used by the ECMAScript replace
   * function in ECMA- 262 [Ecma International, ECMAScript Language
   * Specification, Standard Ecma-262, third edition, 1999], part 15.5.4.11
   * String.prototype.replace. In addition, during search and replace
   * operations all non-overlapping occurrences of the regular expression
   * are located and replaced, and sections of the input that did not match
   * the expression are copied unchanged to the output string.
   * 
   * Format strings (from ECMA-262 [15.5.4.11]):
   * @li $$  The dollar-sign itself ($)
   * @li $&  The matched substring.
   * @li $`  The portion of @a string that precedes the matched substring.
   *         This would be match_results::prefix().
   * @li $'  The portion of @a string that follows the matched substring.
   *         This would be match_results::suffix().
   * @li $n  The nth capture, where n is in [1,9] and $n is not followed by a
   *         decimal digit.  If n <= match_results::size() and the nth capture
   *         is undefined, use the empty string instead.  If n >
   *         match_results::size(), the result is implementation-defined.
   * @li $nn The nnth capture, where nn is a two-digit decimal number on
   *         [01, 99].  If nn <= match_results::size() and the nth capture is
   *         undefined, use the empty string instead. If
   *         nn > match_results::size(), the result is implementation-defined.
   */
  constexpr match_flag_type format_default    = 0;

/**
   * When a regular expression match is to be replaced by a new string, the
   * new string is constructed using the rules used by the POSIX sed utility
   * in IEEE Std 1003.1- 2001 [IEEE, Information Technology -- Portable
   * Operating System Interface (POSIX), IEEE Standard 1003.1-2001].
   */
  constexpr match_flag_type format_sed        = 1 << _S_sed;

/**
   * During a search and replace operation, sections of the character
   * container sequence being searched that do not match the regular
   * expression shall not be copied to the output string.
   */
  constexpr match_flag_type format_no_copy    = 1 << _S_no_copy;

/**
   * When specified during a search and replace operation, only the first
   * occurrence of the regular expression shall be replaced.
   */
  constexpr match_flag_type format_first_only = 1 << _S_first_only;

//@}

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace regex_constants

/* @} */ // group regex
} // namespace std

${this.title}

Code Editor : regex_constants.h