#OH: "the plural of regex is regrets"
@theresnotime http://regexcrossword.com not the original that brought me to this fun game
http://regexle.com brings you the original hex form, now in a daily competition format
And apparently there are game apps now, in both Android and Apple stores.
Regex Crossword

A crossword puzzle game using regular expressions. Earn achievements completing puzzle challenges. Easy tutorials for people new to regular expressions.

Regex Crossword