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  • \$\begingroup\$ Caveat (?): takes a list of two strings, doesn't do anything to parse a one-string input, some people seem to have been worried about that on their answers but those were also different times so I'm not sure what to think Also, technically, the one-byte p would count, but I'd have a hard time justifying that as an answer (plus it's nice to finally have a good use for the declare metapredicate). \$\endgroup\$ Commented Mar 1, 2019 at 3:18