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28 Text processing library [text]

28.6 Regular expressions library [re]

28.6.4 Namespace std​::​regex_constants [re.const]

28.6.4.1 General [re.const.general]

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The namespace std​::​regex_constants holds symbolic constants used by the regular expression library.
This namespace provides three types, syntax_option_type, match_flag_type, and error_type, along with several constants of these types.