Good Regex Tool
 

I am looking for a good regex tool (for windows and free if possible). I am looking for something that will help test, interpret (understand), and possibly help create regular expressions. I have a decent understanding of regular expressions, but I have a project coming up that is going to require me to figure out some pretty complicated ones, so I am looking for a tool to aid me in this. Any suggestions would be most helpful.

Re: Good Regex Tool
 

http://www.txt2re.com/
http://osteele.com/tools/reanimator/

The second one is excellent as it creates a graphical representation of the regular expression in the form of a FSA (Finite-State Automata) and shows how it matches as you type in the text.