Ultrapico’s Expresso – Regular Expressions made enjoyable

You discover Regex, Regular Expressions and go wow, this is so powerful, and then soon the subtle nuances of captured groups, searching and replacing bite you and you want to tear your hair out. Stop … don’t do it, there is help at hand … get Jim Hollenhorst’s Expresso utility.

It’s here:
and it’s free. He does like you to register (all free), as he likes to know if it is getting used, and is really interested in feedback.

Jim has also published  a tutorial on CodeProject:
though built into Expresso you will find plenty of help to build your regular expressions.