[LUA 5.1] string.format

Returns a formatted version of its variable number of arguments following the description given in its first argument (which must be a string).
The format string follows the same rules as the printf family of
standard C functions.
The only differences are that the options/modifiers *, l, L, n, p, and h are not supported and that there is an extra option, q.
The q option formats a string in a form suitable to be safely read back by the Lua interpreter: the string is written between double quotes,
and all double quotes, newlines, embedded zeros, and backslashes in the string are correctly escaped when written.

For instance, the call

string.format('%q', 'a string with "quotes" and new line')

will produce the string:


The options c, d, E, e, f,
g, G, i, o, u, X, and x all expect a number as argument, whereas q and s expect a string.

This function does not accept string values containing embedded zeros.