Namespaces
Variants

std::regex_traits<CharT>:: regex_traits

From cppreference.net
C++
Text processing library
Regular expressions library
Classes
(C++11)
(C++11)
(C++11)
Algorithms
(C++11)
(C++11)
(C++11)
Iterators
(C++11)
(C++11)
Exceptions
(C++11)
Traits
(C++11)
Constants
(C++11)
(C++11)
(C++11)
Regex Grammar
(C++11)
std::regex_traits
regex_traits ( ) ;

Default-constructs the std::regex_traits object, including default-constructing the private std::locale member or any other internal state as necessary.

Parameters

(none)

Return value

(none)

Example

Run this code 
#include <iostream>
#include <regex>
int main()
{
    std::locale::global(std::locale("en_US.utf8"));
    std::regex_traits<char> r1;
    std::regex_traits<wchar_t> r2;
    std::cout << "The regex locale is " << r1.getloc().name() << '\n';
}

Output: 

The regex locale is en_US.utf8