I.o.W the syntax looks compatible but the results may not in edge cases.

Exactly. The basic features are probably in place - I say "probably", as I've not actually looked at the pcre library -, but not all of the advanced features will be. At the very least I would expect that match-time code evaluation isn't; if you have a regular expression using that in a Perl program, I'd bet you will not be able to copy it unmodified to a script written in another language and having it Just Work™.

It's not gonna matter most of the time (famous last words, those), but one should still keep in mind that "Perl-compatible regular expressions" are really "almost-but-not-quite-Perl-compatible regular expressions".

(The fact that different languages all using the pcre library are gonna have compatible regular expressions among each other is added irony.)

In reply to Re^3: Why aren't perl regular expressions really regular expressions? by AppleFritter
in thread Why aren't perl regular expressions really regular expressions? by Dumu

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