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Showing content from https://en.cppreference.com/w/cpp/language/../regex/match_results/../match_flag_type.html below:

std::regex_constants::match_flag_type - cppreference.com

using match_flag_type = /* implementation-defined */;

(1) (since C++11) constexpr match_flag_type match_default =     {};

constexpr match_flag_type match_not_bol =     /* unspecified */;
constexpr match_flag_type match_not_eol =     /* unspecified */;
constexpr match_flag_type match_not_bow =     /* unspecified */;
constexpr match_flag_type match_not_eow =     /* unspecified */;
constexpr match_flag_type match_any =         /* unspecified */;
constexpr match_flag_type match_not_null =    /* unspecified */;
constexpr match_flag_type match_continuous =  /* unspecified */;
constexpr match_flag_type match_prev_avail =  /* unspecified */;
constexpr match_flag_type format_default =    {};
constexpr match_flag_type format_sed =        /* unspecified */;
constexpr match_flag_type format_no_copy =    /* unspecified */;

constexpr match_flag_type format_first_only = /* unspecified */; (2) (since C++11)
(inline since C++17) 1) match_flag_type

is a

BitmaskType

that specifies additional regular expression matching options.

[edit] Constants

Note: [first, last) refers to the character sequence being matched.

Name Explanation match_not_bol The first character in [first, last) will be treated as if it is not at the beginning of a line
(i.e. ^ will not match [first, first)). match_not_eol The last character in [first, last) will be treated as if it is not at the end of a line
(i.e. $ will not match [last, last)). match_not_bow \b will not match [first, first). match_not_eow \b will not match [last, last). match_any If more than one match is possible, then any match is an acceptable result. match_not_null Do not match empty sequences. match_continuous Only match a sub-sequence that begins at first. match_prev_avail --first is a valid iterator position.
When set, causes match_not_bol and match_not_bow to be ignored. format_default Use ECMAScript rules to construct strings in std::regex_replace (syntax documentation). format_sed Use POSIX sed utility rules in std::regex_replace (syntax documentation). format_no_copy Do not copy un-matched strings to the output in std::regex_replace. format_first_only Only replace the first match in std::regex_replace.

All constants, except for match_default and format_default, are bitmask elements. The match_default and format_default constants are empty bitmasks.

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 2053 C++11 1. the constants were declared static
2. match_default and format_default were initialized from ​0​ 1. removed the static specifier
2. initialized from {} [edit] See also attempts to match a regular expression to an entire character sequence
(function template) [edit] general options controlling regex behavior
(typedef) [edit] describes different types of matching errors
(typedef) [edit]

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