Regular Expression Crossword Puzzle

If you know regular expressions, you might find this to be geek fun. A friend of mine posted this, without a solution, but once I started working it, it seemed put together well enough it was likely solvable. Eventually I did solve it, but not before coding up a web interface for verifying my solution and rotating the puzzle in the browser, which I recommend using if you are going to try this out. Or just print it out.

It's actually quite impressive of a puzzle in it's own right. It must have taken a lot of work to create.

My puzzle web interface was also a bit of fun to smash together. I wanted the puzzle to be rotatable, but for the input boxes to stay upright through the rotation. I also wanted the browser to verify the regexps for me as I went along. Getting the hex cells to work in CSS took a bit of doing, and I admit it's not very cleanly done.

Thanks to Dan Lewis for sharing the original puzzle.