Substring (LogiX node)
Str: The input string.
StartIndex: The zero-based starting character position of a substring in Str. Negative start indices are treated as if they were 0.
Length: The number of characters in the substring. If this input is not populated, the default is the length of Str. Negative lengths are treated as if they were 0.
*: The substring of length Length that begins at StartIndex in Str. If StartIndex+Length exceeds the bounds of the input Str, the output is truncated to the end of Str.