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regex_constants::match_flag_type

Flags for regular expression matching options.

typedef T2 match_flag_type;
static const match_flag_type match_any, match_default, match_not_bol,
  match_not_bow, match_continuous, match_not_eol, match_not_eow,
  match_not_null, match_partial, match_prev_avail;

The type is a bitmask type that describes options to be used when matching a text sequence against a regular expression and format flags to be used when replacing text. Options can be combined with |.

The match options are:

match_default

match_not_bol -- do not treat the first position in the target sequence as the beginning of a line

match_not_eol -- do not treat the past-the-end position in the target sequence as the end of a line

match_not_bow -- do not treat the first position in the target sequence as the beginning of a word

match_not_eow -- do not treat the past-the-end position in the target sequence as the end of a word

match_any -- if more than one match is possible any match is acceptable

match_not_null -- do not treat an empty subsequence as a match

match_continuous -- do not search for matches other than at the beginning of the target sequence

match_prev_avail -- --first is a valid iterator; ignore match_not_bol and match_not_bow if set

The format flags are:

format_default -- use ECMAScript format rules

format_sed -- use sed format rules

format_no_copy -- do not copy text that does not match the regular expression

format_first_only -- do not search for matches after the first one

Header: <regex>

Namespace: std

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