std::regex_constants::match_flag_type
| Defined in header <regex>
|
||
| typedef /*unspecified*/ match_flag_type; constexpr match_flag_type match_default = 0; |
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match_flag_type is a Template:concept that specifies additional regular expression matching options.
Constants
Note: [first, last) refers to the character sequence being matched.
| Constant | 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
Notes
In C++11, these constants were specified with redundant keyword static, which was removed by C++14 via LWG issue 2053
See also
| (C++11) |
attempts to match a regular expression to an entire character sequence (function template) |
| (C++11) |
general options controlling regex behavior (typedef) |
| (C++11) |
describes different types of matching errors (typedef) |
