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NAME

       std::regex_constants - ISO C++ 2011 namespace for options and flags used with std::regex.

SYNOPSIS

   5.1 Regular Expression Syntax Options
       enum syntax_option_type : unsigned int { _S_icase, _S_nosubs, _S_optimize, _S_collate,
           _S_ECMAScript, _S_basic, _S_extended, _S_awk, _S_grep, _S_egrep, _S_polynomial,
           _S_multiline }
           This is a bitmask type indicating how to interpret the regex.
       constexpr syntax_option_type icase
       constexpr syntax_option_type nosubs
       constexpr syntax_option_type optimize
       constexpr syntax_option_type collate
       constexpr syntax_option_type ECMAScript
       constexpr syntax_option_type basic
       constexpr syntax_option_type extended
       constexpr syntax_option_type awk
       constexpr syntax_option_type grep
       constexpr syntax_option_type egrep
       constexpr syntax_option_type multiline
       constexpr syntax_option_type __multiline
           Extension: Equivalent to regex_constants::multiline for C++11 and C++14.
       constexpr syntax_option_type __polynomial
       constexpr syntax_option_type operator& (syntax_option_type __a, syntax_option_type __b)
           This is a bitmask type indicating how to interpret the regex.
       constexpr syntax_option_type operator| (syntax_option_type __a, syntax_option_type __b)
           This is a bitmask type indicating how to interpret the regex.
       constexpr syntax_option_type operator^ (syntax_option_type __a, syntax_option_type __b)
           This is a bitmask type indicating how to interpret the regex.
       constexpr syntax_option_type operator~ (syntax_option_type __a)
           This is a bitmask type indicating how to interpret the regex.
       constexpr syntax_option_type & operator&= (syntax_option_type &__a, syntax_option_type
           __b)
           This is a bitmask type indicating how to interpret the regex.
       constexpr syntax_option_type & operator|= (syntax_option_type &__a, syntax_option_type
           __b)
           This is a bitmask type indicating how to interpret the regex.
       constexpr syntax_option_type & operator^= (syntax_option_type &__a, syntax_option_type
           __b)
           This is a bitmask type indicating how to interpret the regex.

   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_type : unsigned int { _S_default, _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 }
           This is a bitmask type indicating regex matching rules.
       constexpr match_flag_type match_default
       constexpr match_flag_type match_not_bol
       constexpr match_flag_type match_not_eol
       constexpr match_flag_type match_not_bow
       constexpr match_flag_type match_not_eow
       constexpr match_flag_type match_any
       constexpr match_flag_type match_not_null
       constexpr match_flag_type match_continuous
       constexpr match_flag_type match_prev_avail
       constexpr match_flag_type format_default
       constexpr match_flag_type format_sed
       constexpr match_flag_type format_no_copy
       constexpr match_flag_type format_first_only
       constexpr match_flag_type operator& (match_flag_type __a, match_flag_type __b)
           This is a bitmask type indicating regex matching rules.
       constexpr match_flag_type operator| (match_flag_type __a, match_flag_type __b)
           This is a bitmask type indicating regex matching rules.
       constexpr match_flag_type operator^ (match_flag_type __a, match_flag_type __b)
           This is a bitmask type indicating regex matching rules.
       constexpr match_flag_type operator~ (match_flag_type __a)
           This is a bitmask type indicating regex matching rules.
       constexpr match_flag_type & operator&= (match_flag_type &__a, match_flag_type __b)
           This is a bitmask type indicating regex matching rules.
       constexpr match_flag_type & operator|= (match_flag_type &__a, match_flag_type __b)
           This is a bitmask type indicating regex matching rules.
       constexpr match_flag_type & operator^= (match_flag_type &__a, match_flag_type __b)
           This is a bitmask type indicating regex matching rules.

   5.3 Error Types
       enum error_type { _S_error_collate, _S_error_ctype, _S_error_escape, _S_error_backref,
           _S_error_brack, _S_error_paren, _S_error_brace, _S_error_badbrace, _S_error_range,
           _S_error_space, _S_error_badrepeat, _S_error_complexity, _S_error_stack, _S_null,
           _S_grammar }
       constexpr error_type error_collate (_S_error_collate)
       constexpr error_type error_ctype (_S_error_ctype)
       constexpr error_type error_escape (_S_error_escape)
       constexpr error_type error_backref (_S_error_backref)
       constexpr error_type error_brack (_S_error_brack)
       constexpr error_type error_paren (_S_error_paren)
       constexpr error_type error_brace (_S_error_brace)
       constexpr error_type error_badbrace (_S_error_badbrace)
       constexpr error_type error_range (_S_error_range)
       constexpr error_type error_space (_S_error_space)
       constexpr error_type error_badrepeat (_S_error_badrepeat)
       constexpr error_type error_complexity (_S_error_complexity)
       constexpr error_type error_stack (_S_error_stack)

Detailed Description

       ISO C++ 2011 namespace for options and flags used with std::regex.

Enumeration Type Documentation

   enum std::regex_constants::error_type
       The expression contained an invalid collating element name.

   enum std::regex_constants::match_flag_type : unsigned int
       This is a bitmask type indicating regex matching rules. The 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 std::regex_constants::syntax_option_type : unsigned int
       This is a bitmask type indicating how to interpret the regex. The 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
       ECMAScript, basic, extended, awk, grep, egrep set.

Function Documentation

   constexpr error_type std::regex_constants::error_backref (_S_error_backref) [inline],
       [constexpr]
       The expression contained an invalid back reference.

   constexpr error_type std::regex_constants::error_badbrace (_S_error_badbrace) [inline],
       [constexpr]
       The expression contained an invalid range in a {} expression.

   constexpr error_type std::regex_constants::error_badrepeat (_S_error_badrepeat) [inline],
       [constexpr]
       One of *?+{ was not preceded by a valid regular expression.

   constexpr error_type std::regex_constants::error_brace (_S_error_brace) [inline],  [constexpr]
       The expression contained mismatched { and }

   constexpr error_type std::regex_constants::error_brack (_S_error_brack) [inline],  [constexpr]
       The expression contained mismatched [ and ].

   constexpr error_type std::regex_constants::error_collate (_S_error_collate) [inline],
       [constexpr]
       The expression contained an invalid collating element name.

   constexpr error_type std::regex_constants::error_complexity (_S_error_complexity) [inline],
       [constexpr]
       The complexity of an attempted match against a regular expression exceeded a pre-set
       level.

   constexpr error_type std::regex_constants::error_ctype (_S_error_ctype) [inline],  [constexpr]
       The expression contained an invalid character class name.

   constexpr error_type std::regex_constants::error_escape (_S_error_escape) [inline],
       [constexpr]
       The expression contained an invalid escaped character, or a trailing escape.

   constexpr error_type std::regex_constants::error_paren (_S_error_paren) [inline],  [constexpr]
       The expression contained mismatched ( and ).

   constexpr error_type std::regex_constants::error_range (_S_error_range) [inline],  [constexpr]
       The expression contained an invalid character range, such as [b-a] in most encodings.

   constexpr error_type std::regex_constants::error_space (_S_error_space) [inline],  [constexpr]
       There was insufficient memory to convert the expression into a finite state machine.

   constexpr error_type std::regex_constants::error_stack (_S_error_stack) [inline],  [constexpr]
       There was insufficient memory to determine whether the regular expression could match the
       specified character sequence.

   constexpr match_flag_type std::regex_constants::operator& (match_flag_type __a,
       match_flag_type __b) [inline],  [constexpr]
       This is a bitmask type indicating regex matching rules. The match_flag_type is
       implementation defined but it is valid to perform bitwise operations on these values and
       expect the right thing to happen.

   constexpr syntax_option_type std::regex_constants::operator& (syntax_option_type __a,
       syntax_option_type __b) [inline],  [constexpr]
       This is a bitmask type indicating how to interpret the regex. The 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
       ECMAScript, basic, extended, awk, grep, egrep set.

   constexpr match_flag_type & std::regex_constants::operator&= (match_flag_type & __a,
       match_flag_type __b) [inline],  [constexpr]
       This is a bitmask type indicating regex matching rules. The match_flag_type is
       implementation defined but it is valid to perform bitwise operations on these values and
       expect the right thing to happen.

   constexpr syntax_option_type & std::regex_constants::operator&= (syntax_option_type & __a,
       syntax_option_type __b) [inline],  [constexpr]
       This is a bitmask type indicating how to interpret the regex. The 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
       ECMAScript, basic, extended, awk, grep, egrep set.

   constexpr match_flag_type std::regex_constants::operator^ (match_flag_type __a,
       match_flag_type __b) [inline],  [constexpr]
       This is a bitmask type indicating regex matching rules. The match_flag_type is
       implementation defined but it is valid to perform bitwise operations on these values and
       expect the right thing to happen.

   constexpr syntax_option_type std::regex_constants::operator^ (syntax_option_type __a,
       syntax_option_type __b) [inline],  [constexpr]
       This is a bitmask type indicating how to interpret the regex. The 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
       ECMAScript, basic, extended, awk, grep, egrep set.

   constexpr match_flag_type & std::regex_constants::operator^= (match_flag_type & __a,
       match_flag_type __b) [inline],  [constexpr]
       This is a bitmask type indicating regex matching rules. The match_flag_type is
       implementation defined but it is valid to perform bitwise operations on these values and
       expect the right thing to happen.

   constexpr syntax_option_type & std::regex_constants::operator^= (syntax_option_type & __a,
       syntax_option_type __b) [inline],  [constexpr]
       This is a bitmask type indicating how to interpret the regex. The 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
       ECMAScript, basic, extended, awk, grep, egrep set.

   constexpr match_flag_type std::regex_constants::operator| (match_flag_type __a,
       match_flag_type __b) [inline],  [constexpr]
       This is a bitmask type indicating regex matching rules. The match_flag_type is
       implementation defined but it is valid to perform bitwise operations on these values and
       expect the right thing to happen.

   constexpr syntax_option_type std::regex_constants::operator| (syntax_option_type __a,
       syntax_option_type __b) [inline],  [constexpr]
       This is a bitmask type indicating how to interpret the regex. The 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
       ECMAScript, basic, extended, awk, grep, egrep set.

   constexpr match_flag_type & std::regex_constants::operator|= (match_flag_type & __a,
       match_flag_type __b) [inline],  [constexpr]
       This is a bitmask type indicating regex matching rules. The match_flag_type is
       implementation defined but it is valid to perform bitwise operations on these values and
       expect the right thing to happen.

   constexpr syntax_option_type & std::regex_constants::operator|= (syntax_option_type & __a,
       syntax_option_type __b) [inline],  [constexpr]
       This is a bitmask type indicating how to interpret the regex. The 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
       ECMAScript, basic, extended, awk, grep, egrep set.

   constexpr match_flag_type std::regex_constants::operator~ (match_flag_type __a) [inline],
       [constexpr]
       This is a bitmask type indicating regex matching rules. The match_flag_type is
       implementation defined but it is valid to perform bitwise operations on these values and
       expect the right thing to happen.

   constexpr syntax_option_type std::regex_constants::operator~ (syntax_option_type __a)
       [inline],  [constexpr]
       This is a bitmask type indicating how to interpret the regex. The 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
       ECMAScript, basic, extended, awk, grep, egrep set.

Variable Documentation

   constexpr syntax_option_type std::regex_constants::__multiline [inline],  [constexpr]
       Extension: Equivalent to regex_constants::multiline for C++11 and C++14.

   constexpr syntax_option_type std::regex_constants::__polynomial [inline],  [constexpr]
       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.

   constexpr syntax_option_type std::regex_constants::awk [inline],  [constexpr]
       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 std::regex_constants::basic [inline],  [constexpr]
       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 std::regex_constants::collate [inline],  [constexpr]
       Specifies that character ranges of the form [a-b] should be locale sensitive.

   constexpr syntax_option_type std::regex_constants::ECMAScript [inline],  [constexpr]
       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 std::regex_constants::egrep [inline],  [constexpr]
       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 std::regex_constants::extended [inline],  [constexpr]
       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 match_flag_type std::regex_constants::format_default [inline],  [constexpr]
       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]):
       •
        $$ The dollar-sign itself ($)
       •
        $& The matched substring.
       •
        $` The portion of string that precedes the matched substring. This would be
        match_results::prefix().
       •
        $' The portion of string that follows the matched substring. This would be
        match_results::suffix().
       •
        $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.
       •
        $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 std::regex_constants::format_first_only [inline],  [constexpr]
       When specified during a search and replace operation, only the first occurrence of the
       regular expression shall be replaced.
   constexpr match_flag_type std::regex_constants::format_no_copy [inline],  [constexpr]
       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 std::regex_constants::format_sed [inline],  [constexpr]
       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 syntax_option_type std::regex_constants::grep [inline],  [constexpr]
       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 std::regex_constants::icase [inline],  [constexpr]
       Specifies that the matching of regular expressions against a character sequence shall be
       performed without regard to case.
   constexpr match_flag_type std::regex_constants::match_any [inline],  [constexpr]
       If more than one match is possible then any match is an acceptable result.
   constexpr match_flag_type std::regex_constants::match_continuous [inline],  [constexpr]
       The expression only matches a sub-sequence that begins at first .
       Referenced by std::regex_iterator< _Bi_iter, _Ch_type, _Rx_traits >::operator++().
   constexpr match_flag_type std::regex_constants::match_default [inline],  [constexpr]
       The default matching rules.
   constexpr match_flag_type std::regex_constants::match_not_bol [inline],  [constexpr]
       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 std::regex_constants::match_not_bow [inline],  [constexpr]
       The expression \b is not matched against the sub-sequence [first,first).
   constexpr match_flag_type std::regex_constants::match_not_eol [inline],  [constexpr]
       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 std::regex_constants::match_not_eow [inline],  [constexpr]
       The expression \b should not be matched against the sub-sequence [last,last).
   constexpr match_flag_type std::regex_constants::match_not_null [inline],  [constexpr]
       The expression does not match an empty sequence.
       Referenced by std::regex_iterator< _Bi_iter, _Ch_type, _Rx_traits >::operator++().
   constexpr match_flag_type std::regex_constants::match_prev_avail [inline],  [constexpr]
       --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.
       Referenced by std::regex_iterator< _Bi_iter, _Ch_type, _Rx_traits >::operator++().
   constexpr syntax_option_type std::regex_constants::multiline [inline],  [constexpr]
       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
   constexpr syntax_option_type std::regex_constants::nosubs [inline],  [constexpr]
       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 std::regex_constants::optimize [inline],  [constexpr]
       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.

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