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std::basic_regex(3) C++ Standard Libary std::basic_regex(3) NAME std::basic_regex - std::basic_regex Synopsis Defined in header <regex> template < class CharT, (since C++11) class Traits = std::regex_traits<CharT> > class basic_regex; The class template basic_regex provides a general framework for holding regular expressions. Several specializations for common character types are provided: Defined in header <regex> Type Definition regex basic_regex<char> wregex basic_regex<wchar_t> Member types Member type Definition value_type CharT traits_type Traits string_type Traits::string_type locale_type Traits::locale_type flag_type std::regex_constants::syntax_option_type Member functions Value Effect(s) icase Character matching should be performed without re- gard to case. When performing matches, all marked sub-expres- sions (expr) are nosubs treated as non-marking sub-expressions (?:expr). No matches are stored in the supplied std::regex_match structure and mark_count() is zero. Instructs the regular expression engine to make matching faster, optimize with the potential cost of making construction slower. For example, this might mean converting a non-deter- ministic FSA to a deterministic FSA. collate Character ranges of the form "[a-b]" will be lo- cale sensitive. multiline (C++17) Specifies that ^ shall match the beginning of a line and $ shall match the end of a line, if the ECMAScript engine is selected. ECMAScript Use the Modified ECMAScript regular expression grammar. basic Use the basic POSIX regular expression grammar (grammar documentation). extended Use the extended POSIX regular expression grammar (grammar documentation). awk Use the regular expression grammar used by the awk utility in POSIX (grammar documentation). Use the regular expression grammar used by the grep utility in grep POSIX. This is effectively the same as the basic option with the addition of newline '\n' as an alternation separa- tor. Use the regular expression grammar used by the grep utility, with egrep the -E option, in POSIX. This is effectively the same as the extended option with the addition of newline '\n' as an alternation separator in addition to '|'. At most one grammar option must be chosen out of ECMAScript, basic, extended, awk, grep, egrep. If no grammar is chosen, ECMAScript is assumed to be selected. The other options serve as modifiers, such that std::regex("meow", std::regex::icase) is equivalent to std::regex("meow", std::regex::EC- MAScript|std::regex::icase). constructor constructs the regex object (public member function) destructor destructs the regex object (public member function) operator= assigns the contents (public member function) assign assigns the contents (public member function) Observers returns the number of marked sub-expressions within the regular mark_count expression (public member function) flags returns the syntax flags (public member function) Locale getloc get locale information (public member function) imbue set locale information (public member function) Modifiers swap swaps the contents (public member function) Constants The member constants in basic_regex are duplicates of the syntax_op- tion_type constants defined in the namespace std::regex_constants. Non-member functions std::swap(std::basic_regex) specializes the std::swap algorithm (C++11) (function template) Deduction guides(since C++17) http://cppreference.com 2022.07.31 std::basic_regex(3)
NAME | Synopsis | Member types | Member functions | Observers | Locale | Modifiers | Constants | Non-member functions
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