[Bug libstdc++/64441] A match_results returns an incorrect sub_match if the sub_match::matched is false

[timshen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64441

Tim Shen <timshen at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Tim Shen <timshen at gcc dot gnu.org> ---
Fixed.