I just received a notice that O’Reilly is publishing a new Regular Expressions Cookbook.  It’s not available yet, so I can’t offer a review, but I’m certainly a fan of Cookbook style books (like this one), because of their simple, problem-solution organization.  The authors are notable regular expression experts, so I expect there will be some good material here.

Other regular expression resources and tools:

• Regular Expression Library – hundreds of pre-written and tested expressions covering many common use cases
• Regular Expression Construction Forum – get advice on writing and optimizing your regular expressions