How do I count through a text field one character at a time? I've looked at reference modification and things like that, but nothing seems to work so far. I need to be able to store the position of specific characters and count them one at a time so that I know which characters to overwrite. Example of the problem: finding credit card numbers in a text field. Must replace these numbers (unformatted: could be 16 digits together or with delimiters such as dashes, etc) with zeros. Suggestions? Examples?