Function SubString

Returns a new substring from the interval [start, end) - inclusive, exclusive. Positions are zero-indexed. For empty or invalid out-of-bounds values returns an empty string "" (in Lua).

For start>end returns substring beginning with start until the actual end of string. For start<0 returns an empty string.

Examples (Lua):

SubString("abc", 0, 0) == ""
SubString("abc", 0, 1) == "a"
SubString("abc", 2, 3) == "c"
SubString("abc", 0, 3) == "abc"
SubString("abcdef", 2, 0) == "cdef"
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