[Bug libstdc++/123901] Consider optimizing std::regex matching algos to convert [first,last) to a std::basic_string and match on that

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123901

--- Comment #2 from Tomasz Kamiński <tkaminsk at gcc dot gnu.org> ---
The above cases was one of my motivations for introducing _Padding_sink in
r16-142-g01e5ef3e8b9128, so when user ask to print first 100 characters from
such rope structure in the debug mode, we will not put it all in single chunk
of memory.