When it comes to Regular Expressions, I start feeling giddy. Even after using them a lot on many projects, I never remember the qualifiers and syntax. It's always RTFM for me when I need to use some regular expressions in my code.
And that happened again today. I looked around the manual and searched online for a "quick fix" on the regular expression I needed. And I found a very interesting online Regular Expression trial / demo / learn by exploring tool. It's made in Flex (and I needed RegExp for Flex) and helped me develop the RegExp I needed in a couple of minutes. (ok, I am still slow, but I found it!)
Thank you Remus Stratulat for creating this useful tool! BTW, he also has a similar tool for JavaScript Regular Expressions.
Click on the image below or here and jump to online regular expression checking tool.
Rob McKeown
Grant Skinner has a great online tool for RegEx testing at http://gskinner.com/RegExr
I use this one all the time.