I second that. Very good idea. The best book I know on RegEx, though maybe an overkill for our purposes, is O'Reilly's Mastering Regular Expressions (
http://www.oreilly.com/catalog/regex/ and
http://www.oreilly.com/catalog/regex2/). What would be easy for us is to collect all channels from the WCC which use RegEx filters, and compile this list in one forum thread - RegEx can best be learned by example.