Description
Extracts a portion of a string to form a new string.
Syntax
Substring ( str1, start[, length])
Arguments
str1 is the source string,
start is the one-based index into string str1 at which the extraction is to begin, and
length is an integer indicating the number of characters to extract.
Remarks
The length parameter is optional and, if omitted, defaults to the end of str1.