It's not able to parse CFG grammers due to it being a stack
machine so it can do backreferencing. I believe it can parse
CFGs due to its ability to do "delayed regexes" - the
construct. 5.004 for instance also uses
a stack to parse regexes, but there's no way you can match
balanced parens with a 5.004 regex. But you can make a CFG
to match balanced parens.
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