[Bug libstdc++/86164] std::regex crashes when matching long lines

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86164

--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Running out of stack space is not acceptable, that's why this is considered a
bug. As already stated in comment 8, I started work on fixing it, but the
rewritten code had bugs that I haven't had time to resolve yet.