Just the other day my friend and super Flex Developer Ryan Swanson released an online Regular Expression Explorer for Flex 3. He has done an excellent job in developing this application and find it to be a very useful tool for doing RegEx in Flex. If you are doing RegEx in your ActionScript code then this tool Ryan built will prove to be extremely helpful.
Check it out: http://blog.ryanswanson.com/2008/10/introducing-flex-3-regular-expression.html
