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> Lua appears to have no literal substring match (find, match, and gmatch all
> take patterns), and also no function for quoting a string into a pattern
> that will match that precise string.  So there seems to be no way (short of
> implementing your own pattern quoting) to do a literal substring match in
> Lua.  Am I missing something?

Your "own pattern quoting" is one line in Lua; see PiL2, page 191. See
also the documentation for string.find (in the manual).

-- Roberto