I haven't looked at the BNF(s) for URIs lately, but I don't recall there being any recursion, so I wouldn't be surprised if the language were regular. There wa

I haven't looked at the BNF(s) for URIs lately, but I don't recall there being any recursion, so I wouldn't be surprised if the language were regular. There was a Perl program that would take something like a BNF and barf out a gigantic regex (maybe with some maximum depth).