I'm going to echo one of the sentiments I came across: this is a splendid way to practice regular expressions. Really! I was a bit rusty and it got me up to speed fairly quick (if you're interested, that's definitely an avenue you can persue with this). 

The only really quick piece of feedback is regarding a tutorial:  it really does need one (nothing major, but quick and snappy one would suffice)

Took me a bit to get into the regex mindset, but a very fun game.

The rules are unclear.
But once you've gone past that, it's great! I'd love to see this game extended upon!

While not really feasible in the time frame of the jam, an interactive tutorial level would go a long way rather than just leaving it to the player to figure out. Also sound effects, and a bit of background music. Maybe a multiplayer mode to play friends. The highlighting was very helpful to figuring out what to do though and it is certainly a unique combat resolution mechanic.

Great game! The highlights on matches are a great help, and it actually makes it fun to get some practice with regex. I can imagine this working as a multiplayer against a friend, too.

Oh man, once I figured out how to play this I had a ton of fun! Really cool concept! The balance could be improved a bit, I found the computer and I were either always hitting each other for 3 points or 1. Some more detailed instructions and sound effects would go a long way.  With a bit more work, I think this game could stand on its own outside of the jam!