Just to let you know that I might have found something that might help you too .
Googling for some help I found two programs that really helped me, YMMV:
Regex Coach :
http://weitz.de/regex-coach/
Kodos :
http://kodos.sourceforge.net/
Where I found Regex Coach the better one with more possiblities and better info on what is happening.
Regards,
Joop