SUBSTR substring,string,start[,length]
A substring is extracted by string from position delimited by start and length.
Parameter Name Mode Type coding Remark 1 substring Output String C or X Result of extraction; max length 255 char. 2 string Input String C or X String by which extract; max length 255 char. 3 start Input Integer F or H or const. Start inside 2nd parameter; first character has position 1 4 length Input Integer F or H or const. If omitted, extraction is to end of string