From Xojo Documentation
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Returns a portion of a String. The first character is numbered 0.
|result||String||The portion of source from start and continuing for length characters or all remaining characters if length is not specified. The encoding of result is the same as the source.|
|start||Integer||Required. The position of the first byte to be returned.
If start is greater than the number of bytes in source, an empty string is returned.
|length||Integer||Optional. The number of bytes to return from source.
If omitted, all bytes from start to the end of source are returned. If length + start is greater than the length of source, all bytes from start to the end of source will be returned.
|stringVariable||String||Any variable of type String.|
MiddleBytes treats source as a series of bytes, rather than a series of characters. MiddleBytes should be used when source represents binary data. The encoding of the result is the same as the encoding of the source string.
These examples use the MiddleBytes function to return portions of a String.