I can’t even begin to tell you how much I’ve used the free RegExr online regular expression tester in the past, but a comment on that article by Oliver pointed out another regex tester that I enjoy because of its sheer simplicity. The thing I wasn’t always fond of with RegExr is that it’s Flash-based and didn’t work on mobile devices such as my iPad. Sure, it’s not often that I’d want to do this on my iPad, but it would be a great way to test an idea that pops in my head when I’m on-the-go.
Despite how great Rejex is there is definitely still a place in my bookmarks for RegExr, which is able to display more details about matches and groupings than Rejex does. So if you’re looking for a powerful online regex editor you’ll probably want to stick with RegExr, otherwise Rejex is about as fast and simple as it gets.