std::regex_constants::match_flag_type
Defined in header <regex> |
||
|---|---|---|
typedef /*unspecified*/ match_flag_type; |
(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*/; |
(since C++11) (until C++17) |
|
inline constexpr match_flag_type match_default = {};
inline constexpr match_flag_type match_not_bol = /*unspecified*/;
inline constexpr match_flag_type match_not_eol = /*unspecified*/;
inline constexpr match_flag_type match_not_bow = /*unspecified*/;
inline constexpr match_flag_type match_not_eow = /*unspecified*/;
inline constexpr match_flag_type match_any = /*unspecified*/;
inline constexpr match_flag_type match_not_null = /*unspecified*/;
inline constexpr match_flag_type match_continuous = /*unspecified*/;
inline constexpr match_flag_type match_prev_avail = /*unspecified*/;
inline constexpr match_flag_type format_default = {};
inline constexpr match_flag_type format_sed = /*unspecified*/;
inline constexpr match_flag_type format_no_copy = /*unspecified*/;
inline constexpr match_flag_type format_first_only = /*unspecified*/; |
(since C++17) |
match_flag_type is a BitmaskType 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.
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 | match_flag_type could not be a scoped enumeration becausematch_default and format_default was required to be initialized from 0 |
made initialized from empty braces |
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) |
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https://en.cppreference.com/w/cpp/regex/match_flag_type
