std::regex_traits

template< class CharT >
class regex_traits;

The type trait template regex_traits supplies std::basic_regex with the set of types and functions necessary to operate on the type CharT.

Since many of regex operations are locale-sensitive (when std::regex_constants::collate flag is set), the regex_traits class typically holds an instance of a std::locale as a private member.

Standard specializations

Two specializations of std::regex_traits are defined by the standard library:

These specializations make it possible to use std::basic_regex<char> (aka std::regex) and std::basic_regex<wchar_t> (aka std::wregex), but in order to use, for example, std::basic_regex<char32_t>, user-provided specializtion std::regex_traits<char32_t> needs to be defined.

Member types

Member functions