I use it as visual feedback from the parser. That is, if I’ve messed up a bracket placement while moving code around, all the code after that will be colored “o

I use it as visual feedback from the parser. That is, if I’ve messed up a bracket placement while moving code around, all the code after that will be colored “oddly” and I can instantly tell both that I’ve made a mistake, and often where exactly that mistake is. I contest that they highlights based on keyword-based regex too. I haven’t formally analyzed TextMate grammars, but I believe the scoping behaviors take them into context free grammar territory.