[Bug libstdc++/65470] regex_search corrupts matches when haystack is destroyed

[aral at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65470

--- Comment #1 from aral at gmx dot de ---
AFAICT the same bug is applicable to the regex_match function. Sorry for the
copy & paste error in the very last comment.