[Bug libstdc++/63776] [C++11] Regex collate matching not working

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63776

--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oops, paste fail. The second one should be:

#include <regex>
#include <cassert>

int main()
{
  std::locale::global(std::locale("en_US.UTF-8"));
  std::wstring s = L"joão méroço";
  std::wregex r{L"[[:alpha:]]{4} [[:alpha:]]{6}"};
  assert( regex_match(s, r) );
}