I've always wondered why there doesn't already exist such a tool. Regex strings are so opaque and hard to read. We can't really fix that for code (short of building objects), but what we could fix is a better way to write them.

A graphical tool to create them, built of units instead of just strings, and the output could still be a regex string.

similar: http://txt2re.com/

+1 to this idea.