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

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                                                    libstdc++                         std::regex_constants(3cxx)

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

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

   enumstd::regex_constants::match_flag_type:unsignedint
       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.

   enumstd::regex_constants::syntax_option_type:unsignedint
       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.

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

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

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

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

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

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

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

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

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

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

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

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

   constexprerror_typestd::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.

   constexprmatch_flag_typestd::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.

   constexprsyntax_option_typestd::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.

   constexprmatch_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.

   constexprsyntax_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.

   constexprmatch_flag_typestd::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.

   constexprsyntax_option_typestd::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.

   constexprmatch_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.

   constexprsyntax_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.

   constexprmatch_flag_typestd::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.

   constexprsyntax_option_typestd::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.

   constexprmatch_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.

   constexprsyntax_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.

   constexprmatch_flag_typestd::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.

   constexprsyntax_option_typestd::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.

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

5.1RegularExpressionSyntaxOptions
       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_typeicase
       constexpr syntax_option_typenosubs
       constexpr syntax_option_typeoptimize
       constexpr syntax_option_typecollate
       constexpr syntax_option_typeECMAScript
       constexpr syntax_option_typebasic
       constexpr syntax_option_typeextended
       constexpr syntax_option_typeawk
       constexpr syntax_option_typegrep
       constexpr syntax_option_typeegrep
       constexpr syntax_option_typemultiline
       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_typeoperator& (syntax_option_type __a, syntax_option_type __b)
           This is a bitmask type indicating how to interpret the regex.
       constexpr syntax_option_typeoperator| (syntax_option_type __a, syntax_option_type __b)
           This is a bitmask type indicating how to interpret the regex.
       constexpr syntax_option_typeoperator^ (syntax_option_type __a, syntax_option_type __b)
           This is a bitmask type indicating how to interpret the regex.
       constexpr syntax_option_typeoperator~ (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.

   5.2MatchingRules
       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_typematch_default
       constexpr match_flag_typematch_not_bol
       constexpr match_flag_typematch_not_eol
       constexpr match_flag_typematch_not_bow
       constexpr match_flag_typematch_not_eow
       constexpr match_flag_typematch_any
       constexpr match_flag_typematch_not_null
       constexpr match_flag_typematch_continuous
       constexpr match_flag_typematch_prev_avail
       constexpr match_flag_typeformat_default
       constexpr match_flag_typeformat_sed
       constexpr match_flag_typeformat_no_copy
       constexpr match_flag_typeformat_first_only
       constexpr match_flag_typeoperator& (match_flag_type __a, match_flag_type __b)
           This is a bitmask type indicating regex matching rules.
       constexpr match_flag_typeoperator| (match_flag_type __a, match_flag_type __b)
           This is a bitmask type indicating regex matching rules.
       constexpr match_flag_typeoperator^ (match_flag_type __a, match_flag_type __b)
           This is a bitmask type indicating regex matching rules.
       constexpr match_flag_typeoperator~ (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.

   5.3ErrorTypes
       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_typeerror_collate (_S_error_collate)
       constexpr error_typeerror_ctype (_S_error_ctype)
       constexpr error_typeerror_escape (_S_error_escape)
       constexpr error_typeerror_backref (_S_error_backref)
       constexpr error_typeerror_brack (_S_error_brack)
       constexpr error_typeerror_paren (_S_error_paren)
       constexpr error_typeerror_brace (_S_error_brace)
       constexpr error_typeerror_badbrace (_S_error_badbrace)
       constexpr error_typeerror_range (_S_error_range)
       constexpr error_typeerror_space (_S_error_space)
       constexpr error_typeerror_badrepeat (_S_error_badrepeat)
       constexpr error_typeerror_complexity (_S_error_complexity)
       constexpr error_typeerror_stack (_S_error_stack)

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

   constexprsyntax_option_typestd::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.

   constexprsyntax_option_typestd::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).

   constexprsyntax_option_typestd::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].

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

   constexprsyntax_option_typestd::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.

   constexprsyntax_option_typestd::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.

   constexprsyntax_option_typestd::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.

   constexprmatch_flag_typestd::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.
   constexprmatch_flag_typestd::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.
   constexprmatch_flag_typestd::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.
   constexprmatch_flag_typestd::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].
   constexprsyntax_option_typestd::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.
   constexprsyntax_option_typestd::regex_constants::icase[inline],[constexpr]
       Specifies that the matching of regular expressions  against  a  character  sequence  shall  be  performed
       without regard to case.
   constexprmatch_flag_typestd::regex_constants::match_any[inline],[constexpr]
       If more than one match is possible then any match is an acceptable result.
   constexprmatch_flag_typestd::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++().
   constexprmatch_flag_typestd::regex_constants::match_default[inline],[constexpr]
       The default matching rules.
   constexprmatch_flag_typestd::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).
   constexprmatch_flag_typestd::regex_constants::match_not_bow[inline],[constexpr]
       The expression \b is not matched against the sub-sequence [first,first).
   constexprmatch_flag_typestd::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).
   constexprmatch_flag_typestd::regex_constants::match_not_eow[inline],[constexpr]
       The expression \b should not be matched against the sub-sequence [last,last).
   constexprmatch_flag_typestd::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++().
   constexprmatch_flag_typestd::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++().
   constexprsyntax_option_typestd::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
   constexprsyntax_option_typestd::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.
   constexprsyntax_option_typestd::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.