Sigh. https://swtch.com/~rsc/regexp/regexp1.html https://swtch.com/~rsc/regexp/regexp1.html Sadly, RegEx has evolved far away from the original regular express

Sigh. https://swtch.com/~rsc/regexp/regexp1.html https://swtch.com/~rsc/regexp/regexp1.html Sadly, RegEx has evolved far away from the original regular expression we learnt in school, and it is certainly less NFA like. This make it harder to execute a faster speed, e.g. backtracing makes it more context sensitive etc.