The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. ... The PCRE library is free, even for building commercial software.
That's what PCRE is. If you don't know what regular expressions are, you can think of them as very flexible and advanced (but easy to use) string matching. It's something I've wanted in BlitzMax for a long time, and only today I decided that I'd actually bother to write a module to use PCRE.
If you do a lot of parsing and the like, you'll want this. Believe me, regular expressions make a world of difference when used properly. Most of the modules I write, I write special scripts to scan header files (most, not all.. some are just too messy and diverse in their layout), and of course the scripts use regular expressions to find what I'm looking for.
Honestly, I'm surprised Brucey didn't jump on this one already. ;)
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PCRE's website. Documentation can be found there in the form of manpages.