The "Perl uses a NFSA" statement is not strictly true. So-called regular expressions in Perl accept languages ordinary FSA's cannot.

/^(.+)\1$/ matches a string iff its second half is the same as its first. It is fairly easy to show (via the Pumping Lemma, or even a simple counting argument) no FSA can match this class of strings.

So, even if an optimizer existed (and they do), it probably wouldn't be directly applicatible to Perl pattern matching.

In reply to Re: Regular Expression Optimizer by indigo
in thread Regular Expression Optimizer by PsychoSpunk

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