[Bug libstdc++/93502] std::regex_match uses stack space proportional to input string length

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93502

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Another question would be whether it's easy for the programmer to direct
std::regex_match to use the heap?