39     typedef std::basic_regex<CharT> BR;  in test()  typedef
40     static_assert((BR::icase == std::regex_constants::icase), "");  in test()
41     static_assert((BR::nosubs == std::regex_constants::nosubs), "");  in test()
42     static_assert((BR::optimize == std::regex_constants::optimize), "");  in test()
43     static_assert((BR::collate == std::regex_constants::collate), "");  in test()
44     static_assert((BR::ECMAScript == std::regex_constants::ECMAScript), "");  in test()
45     static_assert((BR::basic == std::regex_constants::basic), "");  in test()
46     static_assert((BR::extended == std::regex_constants::extended), "");  in test()
47     static_assert((BR::awk == std::regex_constants::awk), "");  in test()
48     static_assert((BR::grep == std::regex_constants::grep), "");  in test()
49     static_assert((BR::egrep == std::regex_constants::egrep), "");  in test()
50     where(BR::icase);  in test()
51     where(BR::nosubs);  in test()
52     where(BR::optimize);  in test()
53     where(BR::collate);  in test()
54     where(BR::ECMAScript);  in test()
55     where(BR::basic);  in test()
56     where(BR::extended);  in test()
57     where(BR::awk);  in test()
58     where(BR::grep);  in test()
59     where(BR::egrep);  in test()