Debuggex: A visual regex debugger 
This is the best RegEx web-site that I have seen. It is actually quite far ahead of everyone else.Unfortunately if you don't "understand" RegEx it won't help much. It is more for people who already have it down.For me I am still stuck in copy/paste land. I could never get my head around the "logic" of RegEx, it just seems completely random and arbitrary.Plus they re-use the same characters but have multiple meanings (e.g. ^ for NOT and for START).