I want to use a parser; not learn about the theory behind them.
Part of the problem of lousy documentation is that you have to know enough theory to know both what type of parser you can use on a grammar and if your grammar is even parsable. Because semi-structured text can vary so much in the structure and meaning, the best any general purpose grammar engine can do is push back on you a little bit to figure out whether your language is a regular language, whether you need lookahead and how much, and how you handle things like recursion, if at all.
Also a lot of the theoretical work comes from the world of linguistics, which is messy on its own.
I agree about lousy APIs though.
I can't speak about the performance of Regexp::Grammars, but if I were doing something like this, I'd start there for ease of use. I'd use Marpa for speed and completeness.
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