As a web application developer knowledge of regular expressions, or at least, what they can do for you, is a mUSt. These strange looking character sets can do anything from checking for a numeric value in a textbox to protecting against cross-site scripting (XSS) .
Here's an article a pal (thanks Ramal)directed me to lately that I think is well.. appropriately titled! : 5 Regular Expressions Every Web Programmer Should Know.
Truth-be-told though, I think (web) developers should seriously understand how to construct their own, as the need for unique expressions is almost inevitable. However, if you're in a rush and need one quickly (as is often the case with me), you can head over to this library, it's pretty extensive and the expressions are reasonably reliable.
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