[Bug libstdc++/120212] : Optional empty repetitions should not match

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120212

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Is this rule the same in the 3rd edition of the ECMAScript spec, which is what
C++ references?