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> The weasel words of the ISO C standard say:
> "the term control character refers to a member of a locale-specific
> set of characters that are not printing characters."
> Therefore one cannot, sadly, deduce that string.match(s, "%C") is the
> same as isprint.
> (isgraph is the same as isprint, but is not true for the space character).
> I plan to add isprint and isgraph to luaposix for this reason (in
> common with some other useful bits of the C standard library that are
> missing from the Lua standard libraries).

'%g' (isgraph) was added to Lua 5.2 (work 4 already has it). Isprint
is then equivalent to [%g ].

-- Roberto