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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../cpp/regex/regex_traits.html below:

std::regex_traits - cppreference.com

template< class CharT >
class regex_traits;

(since C++11)

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.

[edit] Standard specializations

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

std::regex_traits<char> std::regex_traits<wchar_t>

These specializations make it possible to use std::basic_regex<char> (aka std::regex) and std::basic_regex<wchar_t> (aka std::wregex). To use std::basic_regex with other character types (for example, char32_t), a user-provided trait class must be used.

[edit] Member types Type Definition char_type CharT string_type std::basic_string<CharT> locale_type The locale used for localized behavior in the regular expression. Must be CopyConstructible char_class_type Represents a character classification and is capable of holding an implementation specific set returned by lookup_classname. Must be a BitmaskType. [edit] Member functions constructs the regex_traits object
(public member function) [edit] calculates the length of a null-terminated character string
(public static member function) [edit] determines the equivalence key for a character
(public member function) [edit] determines the case-insensitive equivalence key for a character
(public member function) [edit] determines the sort key for the given string, used to provide collation order
(public member function) [edit] determines the primary sort key for the character sequence, used to determine equivalence class
(public member function) [edit] gets a collation element by name
(public member function) [edit] gets a character class by name
(public member function) [edit] indicates membership in a localized character class
(public member function) [edit] translates the character representing a numeric digit into an integral value
(public member function) [edit] sets the locale
(public member function) [edit] gets the locale
(public member function) [edit]

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