locale_type getloc() const;
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// basic_regex::getloc
// note: using regex, a standard alias of basic_regex<char>
#include <iostream>
#include <regex>
#include <locale>
int main ()
{
std::regex myregex;
std::locale mylocale ("");
myregex.imbue (mylocale);
myregex.assign ("sub[a-z]*");
if (std::regex_match ("subject", myregex))
std::cout << "The string matches";
else
std::cout << "The string does not match";
std::cout << " using locale: " << myregex.getloc().name() << std::endl;
return 0;
}The string matches using locale: en-US