![]() ![]() ![]() The member constants in basic_regex are duplicates of the syntax_option_type constants defined in the namespace std::regex_constants. The other options serve as modifiers, such that std :: regex ( "meow", std :: regex :: icase ) is equivalent to std :: regex ( "meow", std :: regex :: ECMAScript |std :: regex :: icase ). ![]() If no grammar is chosen, ECMAScript is assumed to be selected. This is effectively the same as the extended option with the addition of newline ' \n' as an alternation separator in addition to '|'.Īt most one grammar option must be chosen out of ECMAScript, basic, extended, awk, grep, egrep. Use the regular expression grammar used by the grep utility, with the -E option, in POSIX. This is effectively the same as the basic option with the addition of newline ' \n' as an alternation separator. Use the regular expression grammar used by the grep utility in POSIX. Use the regular expression grammar used by the awk utility in POSIX ( grammar documentation). Use the extended POSIX regular expression grammar ( grammar documentation). Use the basic POSIX regular expression grammar ( grammar documentation). Use the Modified ECMAScript regular expression grammar. RegExr is an online tool to learn, build,
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