Regex Chess: A 2-ply minimax chess engine in 84,688 regular expressions

At the top of this article you are presented with a very basic rendering of a chess board and an input field where you're supposed to type chess moves:

Although this chess engine isn't very smart, since it fell for the Scholar's mate after checking me with a rogue bishop, the part of the engine that is computing what move to play is a series of 84,688 regular expressions... The full explanation of how the engine works is brilliant and is available immediately under the chessboard. For reference, I did beat the engine when I played 5. Qxf7#: