This is a canonical case of premature optimisation. I have performance problems with the database backend, the network, disk access, but too slow a regex is a c

This is a canonical case of premature optimisation. I have performance problems with the database backend, the network, disk access, but too slow a regex is a completely non-existing problem in real-life for me. Or else I wouldn't be using Perl/PHP/Python/Ruby but C/C++/Rust/Java etc.