std::regex_constants::match_flag_type
STD：：regex[医]常量：：匹配[医]旗子[医]类型
| Defined in header | | |
|---|---|---|
| typedef /*unspecified*/ match_flag_type; | | (since C++11) |
| constexpr match_flag_type match_default = 0; 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 = 0; 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 = 0; 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 = 0; 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是BitmaskType指定其他正则表达式匹配选项的。
常数
注：[first, last)指正在匹配的字符序列。
| 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 |
所有常量，除match_default和format_default，是位掩码元素。大match_default和format_default常量是空位掩码。
注记
在C++11中，这些常量是用冗余关键字指定的。static，它被C++14通过lwg第2053期...
另见
| regex_match (C++11) | attempts to match a regular expression to an entire character sequence (function template) |
|---|---|
| syntax_option_type (C++11) | general options controlling regex behavior (typedef) |
| error_type (C++11) | describes different types of matching errors (typedef) |
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