what 262,715 regex questions on stack overflow haven't answered
complement, intersection, and why the most common regex workarounds are hundreds of times slower than they need to be
blog regex performance security
complement, intersection, and why the most common regex workarounds are hundreds of times slower than they need to be
every regex engine that promises linear time breaks that promise the moment you ask for all matches. the problem has been there since the 70s, hiding in the iteration loop.