regex_constants::match_flag_type

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:

The format flags are: