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Lua-Api
String
[LUA 5.1] string.sub
function string.sub ( s, i, j )
Returns the substring of s that starts at i and continues until j; i and j may be negative.
If j is absent, then it is assumed to be equal to -1 (which is the same as the string length).
In particular, the call string.sub(s,1,j) returns a prefix of s with length j, and string.sub(s, -i) returns a suffix of s with length i.
If j is absent, then it is assumed to be equal to -1 (which is the same as the string length).
In particular, the call string.sub(s,1,j) returns a prefix of s with length j, and string.sub(s, -i) returns a suffix of s with length i.