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>> And I'm not talking a minor technicality here, but the
>> fundamental fact that regular expressions involve
>> recursively defining expressions; there's none of that in
>> Lua pattern matching.
> The conventional/traditional meaning of the term "regular
> expression" most certainly does not require recursion.
> Indeed, it's precisely the _lack_ of recursion that is
> often used to differentiate between REs and more powerful
> types of grammars.

Tim means that regular expressions can do stuff like




whereas in Lua patterns operators like "*" cannot apply to
parenthesized subgroups.