Returns a substring of a string
Returns a substring of the string, starting at index 'start' and ending at index 'end'. Both may be negative to indicate counting from the right. The end point is optional and defaults to -1, which is the entire rest of the string.
See also utils.utf8sub for doing the identical operation with UTF-8 strings.
See Also ...
string.byte - Converts a character into its ASCII (decimal) equivalent
Lua base functions
(Help topic: lua=string.sub)
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