Here is an example of GROUPRANGE. This is indexing a large log file and the grouprange index will give me the start and end times for the log which are in the format hh:mm:ss
FIELD1=0,12,6,(TRIGGER=1,BASE=0)
FIELD2=0,21,5,(TRIGGER=1,BASE=0)
FIELD3=*,*,8,(OFFSET=(27:34),MASK='##:##:##',ORDER=BYROW)
INDEX1=X'D985979699A36DD5819485',FIELD1,(TYPE=GROUP,BREAK=NO) /* Report_Name */
INDEX2=X'D396876DC481A385',FIELD2,(TYPE=GROUP,BREAK=NO) /* Log_Date */
INDEX3=X'D396876DE3899485',FIELD3,(TYPE=GROUPRANGE,BREAK=NO) /* Log_Time */