I had a simple request to compare 2 files of cost center text and output the differences in the text for FY 2011 from our SAP production system. I've done it in ABAP, but how do I do it in REBOL? The record format for file 1 is fixed; 201185242118524211PERMIT SUPPORT SERVICES DIV 1000SP01A2" The record format for file 2 is: 852421120100701BUD DEV-HAZ WASZTE SITE CLEANUP I need to read file1 to get only those with the first 4 of "2011" and the last 2 of "A2". Then I need to compare user the next 7 characters, which is the cost center, and match with file2 to compare the text and output differences. I think I've got how to read the file and search thru another file for matches, but how do I split/parse file 1 into segments I can use and compare? I don't seem to "get it." Thanks!!