#include <regex>
#include <type_traits>
int main()
{
static_assert((std::is_same<std::basic_regex<char>::value_type, char>::value), "");
static_assert((std::is_same<std::basic_regex<char>::flag_type,
std::regex_constants::syntax_option_type>::value), "");
static_assert((std::is_same<std::basic_regex<char>::locale_type, std::locale>::value), "");
static_assert((std::is_same<std::basic_regex<wchar_t>::value_type, wchar_t>::value), "");
static_assert((std::is_same<std::basic_regex<wchar_t>::flag_type,
std::regex_constants::syntax_option_type>::value), "");
static_assert((std::is_same<std::basic_regex<wchar_t>::locale_type, std::locale>::value), "");
}