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You don't need anything else than Eclipse 3.4+ version. The feature itself uses the standard java regular expressions and is actually fairly simple to understand. I would recommend to have a go at regular expressions before trying that feature. You may use these plugins Bastian Bergerhoff's Brosinski's to help your work.
You may also use online tools like gskinner's or regextester to test the results. Another great read is also: http://java.sun.com/developer/technicalArticles/releases/1.4regex

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