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Is there any formal documentation of how to implement your own regular expression library? What formal documentation, if any, did the makers of the exisiting regular expression libriaries base their code on?
I have written (and abandoned) a javascript parser, including regular expression support. I based it on the ECMAscript definition, which according to itself uses Perl5 regular expressions. This is ECMA 262, I used the 3rd edition, from december 1999. (There is a newer one by now, I don’t know if it is as complete in its definition of regular expressions.)