Thanks to this post on Hacker News, I was reminded of the joy of regex crosswords :-)

Nice to see that the regexcrossword.com site has gained quite a list of puzzles and challenges since the last time I blogged about it.

Also very cool is the RegEx Crossword project of Jimb Esser, which provides a very smooth interface for solving hexagonal regex crosswords in the browser.
I remember solving the original MIT hexagonal regex crossword on paper back in the time.

And in addition there is a built-in editor which allows you to create your own hexagonal regex crosswords.
Thinking of using this to create some fun puzzle for the colleagues at work.