Which are the best regular expression testing tools online?
http://gskinner.com/RegExr/ – offers great support, samples, history and has a community of users behind it
http://www.regextester.com/ – tester tool plus examples and constant updates
http://regexpal.com/ – offers a bunch of extra options plus history, help a blog and help community
http://www.nvcc.edu/home/drodgers/ceu/resources/test_regexp.asp – simplest tool ever!