Joined: 15 Feb 2005 Posts: 4579 Location: San Jose, CA
Please give more details. It's unclear if you want to put 'x' in position n in every record, or put 'x' in position n only in records that have 'y' in position n.
Please show a concrete example of your input records and what you want the output records to look like. State the relevent position, length and strings.