Returns the part of a string between the start index and a number of characters after it.
substr( Str String, Index Integer, Count Integer ): String
Str is the string to search.
Index is the position where to start the extraction. First character is at index 1.
Count is the number of characters to extract.
Type: String. If Index is greater than, or equal, to the length of the Str, the function returns an empty string.
Examples of using
substr(dataset_field_val(1, 'Address'), 1, 4)