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I can highly recommend the following tool: Mastering Regular Expressions by Jeffrey Friedl http://shop.oreilly.com/product/9780596528126.do http://shop.oreilly.com/product/9780596528126.do I found the pacing to be excellent, with complimentary exercises and that it was educational as both a cheatsheet and a coherent text. Learned a lot from it, despite being experienced from the outset.