[Bug libstdc++/61227] [C++11] Regex does not work

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61227

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
So it does, thanks, Andreas. I read C++11 [re.grammar]/7 as saying those
classes are part of the changes to the ECMAScript spec.