I thought some use of exe and variables would clean up the code, but the amount of regex escaping made me decide against that.

This will create an unmaintainable mess. There has to be a better way of implementing this. Is it possible to make @Spell conditional with syntax groups? Otherwise execute is the better option; regex doesn't need to be escaped when using single quotes.

Hmm, I'd prefer to entirely remove spell checking strings since they aren't really meant to correspond strictly to actual human language (e.g keys in a dict like a, b, c).

Otherwise, I could implement something with execute. I had another branch with some work on that.