I know something about regular expressions, parse trees and abstract syntax trees. But once I read there is still another parsing technique that, as far as I remember, people from SO used to re-implement its markdown parser.
What I don’t recall is the name of this method, or how it did work. Do you? If not, what it could be?
Maybe you’re thinking of Parsing Expression Grammars?
(If I’m remembering the same thing you’re remembering, it’s cletus writing about this here.)