The Regular Expression are the sole of Perl language, and for bioinformatician it is just a magical stick to resolve gingatic string data. We did not find any good and user friendly regular expression cheat sheet, hence write our own cheat sheet. The Regular Expressions Cheat Sheet, a quick reference guide for regular expressions, including symbols, ranges, grouping, assertions and some sample patterns to get you started.
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You can also use this regular expression tutorial @ http://sunsite.ualberta.ca/Documentation/Misc/perl-5.6.1/pod/perlretut.html
I also find this cheat sheet more informative http://ult-tex.net/info/perl/