// Namespace std::regex_constants -*- C++ -*-
// Copyright (C) 2010-2025 Free Software Foundation, Inc.
//
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/**
* @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)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @defgroup regex Regular Expressions
*
* A facility for performing regular expression pattern matching.
*
* @since C++11
*
* @{
*/
/**
* @namespace std::regex_constants
* @brief ISO C++ 2011 namespace for options and flags used with std::regex
*/
namespace regex_constants
{
/**
* @name 5.1 Regular Expression Syntax Options
*/
///@{
/**
* @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.
*/
enum [[__gnu__::__flag_enum__]] syntax_option_type : unsigned int
{
_S_icase = 1 << 0,
_S_nosubs = 1 << 1,
_S_optimize = 1 << 2,
_S_collate = 1 << 3,
_S_ECMAScript = 1 << 4,
_S_basic = 1 << 5,
_S_extended = 1 << 6,
_S_awk = 1 << 7,
_S_grep = 1 << 8,
_S_egrep = 1 << 9,
_S_polynomial = 1 << 10,
_S_multiline = 1 << 11
};
/**
* Specifies that the matching of regular expressions against a character
* sequence shall be performed without regard to case.
*/
_GLIBCXX17_INLINE constexpr syntax_option_type icase = _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.
*/
_GLIBCXX17_INLINE constexpr syntax_option_type nosubs = _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.
*/
_GLIBCXX17_INLINE constexpr syntax_option_type optimize = _S_optimize;
/**
* Specifies that character ranges of the form [a-b] should be locale
* sensitive.
*/
_GLIBCXX17_INLINE constexpr syntax_option_type collate = _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.
*/
_GLIBCXX17_INLINE constexpr syntax_option_type ECMAScript = _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].
*/
_GLIBCXX17_INLINE constexpr syntax_option_type basic = _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.
*/
_GLIBCXX17_INLINE constexpr syntax_option_type extended = _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).
*/
_GLIBCXX17_INLINE constexpr syntax_option_type awk = _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.
*/
_GLIBCXX17_INLINE constexpr syntax_option_type grep = _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.
*/
_GLIBCXX17_INLINE constexpr syntax_option_type egrep = _S_egrep;
#if __cplusplus >= 201703L || !defined __STRICT_ANSI__
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2503. multiline option should be added to syntax_option_type
/**
* Specifies that the `^` anchor matches at the beginning of a line,
* and the `$` anchor matches at the end of a line, not only at the
* beginning/end of the input.
* Valid for the ECMAScript syntax, ignored otherwise.
* @since C++17
*/
_GLIBCXX17_INLINE constexpr syntax_option_type multiline = _S_multiline;
#endif
/// Extension: Equivalent to regex_constants::multiline for C++11 and C++14.
_GLIBCXX17_INLINE constexpr syntax_option_type __multiline = _S_multiline;
/**
* Extension: Ensure both space complexity of compiled regex and
* time complexity execution are not exponential.
* If specified in a regex with back-references, the exception
* regex_constants::error_complexity will be thrown.
*/
_GLIBCXX17_INLINE constexpr syntax_option_type __polynomial = _S_polynomial;
[[__nodiscard__]]
constexpr syntax_option_type
operator&(syntax_option_type __a, syntax_option_type __b) noexcept
{
return (syntax_option_type)(static_cast<unsigned int>(__a)
& static_cast<unsigned int>(__b));
}
[[__nodiscard__]]
constexpr syntax_option_type
operator|(syntax_option_type __a, syntax_option_type __b) noexcept
{
return (syntax_option_type)(static_cast<unsigned int>(__a)
| static_cast<unsigned int>(__b));
}
[[__nodiscard__]]
constexpr syntax_option_type
operator^(syntax_option_type __a, syntax_option_type __b) noexcept
{
return (syntax_option_type)(static_cast<unsigned int>(__a)
^ static_cast<unsigned int>(__b));
}
[[__nodiscard__]]
constexpr syntax_option_type
operator~(syntax_option_type __a) noexcept
{ return (syntax_option_type)(~static_cast<unsigned int>(__a)); }
_GLIBCXX14_CONSTEXPR
inline syntax_option_type&
operator&=(syntax_option_type& __a, syntax_option_type __b) noexcept
{ return __a = __a & __b; }
_GLIBCXX14_CONSTEXPR
inline syntax_option_type&
operator|=(syntax_option_type& __a, syntax_option_type __b) noexcept
{ return __a = __a | __b; }
_GLIBCXX14_CONSTEXPR
inline syntax_option_type&
operator^=(syntax_option_type& __a, syntax_option_type __b) noexcept
{ return __a = __a ^ __b; }
///@}
/**
* @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.
*
*/
///@{
/**
* @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.
*/
enum match_flag_type : unsigned int
{
_S_default,
_S_not_bol = 1 << 0,
_S_not_eol = 1 << 1,
_S_not_bow = 1 << 2,
_S_not_eow = 1 << 3,
_S_any = 1 << 4,
_S_not_null = 1 << 5,
_S_continuous = 1 << 6,
_S_prev_avail = 1 << 7,
_S_sed = 1 << 8,
_S_no_copy = 1 << 9,
_S_first_only = 1 << 10,
_S_match_flag_last = 1 << 11
};
/**
* The default matching rules.
*/
_GLIBCXX17_INLINE constexpr match_flag_type match_default = _S_default;
/**
* 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).
*/
_GLIBCXX17_INLINE constexpr match_flag_type match_not_bol = _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).
*/
_GLIBCXX17_INLINE constexpr match_flag_type match_not_eol = _S_not_eol;
/**
* The expression \\b is not matched against the sub-sequence
* [first,first).
*/
_GLIBCXX17_INLINE constexpr match_flag_type match_not_bow = _S_not_bow;
/**
* The expression \\b should not be matched against the sub-sequence
* [last,last).
*/
_GLIBCXX17_INLINE constexpr match_flag_type match_not_eow = _S_not_eow;
/**
* If more than one match is possible then any match is an acceptable
* result.
*/
_GLIBCXX17_INLINE constexpr match_flag_type match_any = _S_any;
/**
* The expression does not match an empty sequence.
*/
_GLIBCXX17_INLINE constexpr match_flag_type match_not_null = _S_not_null;
/**
* The expression only matches a sub-sequence that begins at first .
*/
_GLIBCXX17_INLINE constexpr match_flag_type match_continuous = _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 algorithms
* `regex_match`, `regex_search`, and `regex_replace`, and by the iterators
* `regex_iterator` and `regex_token_iterator`.
*/
_GLIBCXX17_INLINE constexpr match_flag_type match_prev_avail = _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.
*/
_GLIBCXX17_INLINE constexpr match_flag_type format_default = _S_default;
/**
* 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].
*/
_GLIBCXX17_INLINE constexpr match_flag_type format_sed = _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.
*/
_GLIBCXX17_INLINE constexpr match_flag_type format_no_copy = _S_no_copy;
/**
* When specified during a search and replace operation, only the first
* occurrence of the regular expression shall be replaced.
*/
_GLIBCXX17_INLINE constexpr match_flag_type format_first_only = _S_first_only;
[[__nodiscard__]]
constexpr match_flag_type
operator&(match_flag_type __a, match_flag_type __b) noexcept
{
return (match_flag_type)(static_cast<unsigned int>(__a)
& static_cast<unsigned int>(__b));
}
[[__nodiscard__]]
constexpr match_flag_type
operator|(match_flag_type __a, match_flag_type __b) noexcept
{
return (match_flag_type)(static_cast<unsigned int>(__a)
| static_cast<unsigned int>(__b));
}
[[__nodiscard__]]
constexpr match_flag_type
operator^(match_flag_type __a, match_flag_type __b) noexcept
{
return (match_flag_type)(static_cast<unsigned int>(__a)
^ static_cast<unsigned int>(__b));
}
[[__nodiscard__]]
constexpr match_flag_type
operator~(match_flag_type __a) noexcept
{ return (match_flag_type)(~static_cast<unsigned int>(__a)); }
_GLIBCXX14_CONSTEXPR
inline match_flag_type&
operator&=(match_flag_type& __a, match_flag_type __b) noexcept
{ return __a = __a & __b; }
_GLIBCXX14_CONSTEXPR
inline match_flag_type&
operator|=(match_flag_type& __a, match_flag_type __b) noexcept
{ return __a = __a | __b; }
_GLIBCXX14_CONSTEXPR
inline match_flag_type&
operator^=(match_flag_type& __a, match_flag_type __b) noexcept
{ return __a = __a ^ __b; }
///@}
} // namespace regex_constants
/// @} group regex
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std