There's a regex contest underway.

As for what kind of content is eligible, well, pretty much anything as long as it's regex related. You can write a regex joke (preferably not ending with the punchline "now they have two problems"), post a regex article somewhere, create a regex comic strip, share your favorite regex you've written, try to write a sentence in regex (example), design a regex superhero, create a regex game, tell a story about how regexes saved the day, link to a blog post you've written about Regular Expression Day, or whatever you can come up with. Go nuts.

So be creative, participate, spread the word, and have fun!

(I hope this isn't a duplicate, I can't remember where I got the link from)