I would love to see a sort of versus mode be made where real people could play each other. I kind of feel like the hard AI could have some optimizations made along the lines of matches to increase the challenge level, and some cards are kind of broken, but still great. Helping me be more efficient with regex already XD. I think that after using each card, it needs to be discarded, in order to encourage more interactive gameplay. Either that, or the enemy needs to start making defensive swap options (i.e. moving a card with digits off the field when you have a \d or [0-9] card with a {2,5} on the field as well.)