substring(str, start, subStringLength)
Creates a substring from str. The substring begins at start and is at most subStringLength characters long.
The first character of the string has the value 0. So if you set start to ‘2’, the substring will start with the third character.
In the following example a substring from the string is created, starting with the 4th character and being 5 characters long.
substring("123456789", 3, 5)
This example will result in the substring “45678”.
Help with configuring/using