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2012/6/21  <>:

> I want to access/retrieve the n-th character.
> I scanned through the String Tutorial, the String Library Tutotrial
> and the online version of Programming Lua and found nothing what
> seems appropiate to me...but I am sure that's due to me.... :)

There's some good (though advanced) stuff on the Lua Wiki:

E.g. you're shown how to get this:

-- demo
return a[4]       --> d
return a(3,5)     --> cde
return a{1,-4,5}  --> ace

So there you have it: one-byte substrings with square brackets,
to-from substrings with round, selected bytes with curly.