Heh, cool concept. Could maybe add some interactive configuration common password gen tools have like choose length, characters used (upper, lower, numbers, symbols) so people not accustomed to regex can play with (and see how for each configuration the regex changes).

Your regex-utils library also interesting, especially the set operations part.

Okay, this is kindof incredible. The ability to create a complicated regex from smaller pieces combined in a logical way is insane. This has so many uses.

https://github.com/gruhn/regex-utils#comment-regex-using-com...