SUBSTR action returns part of a string. syntax SUBSTR ("string", start, length) parameters String The string from which to extract a substring. Start Numeric value representing the offset in the string where the substring begins. Length Numeric value representing the length of the substring. returns The substring indicated by start and length. example $x = SUBSTR(@USERID, LEN(@USERID) - 2, 2)   ; get the last 2 chars of the userid