Use Excel data validation to prevent duplicate values in a column Your email has been sent Prevent duplicates before they happen by combining a simple function with data validation. Excel has built-in ...

Granted, that single line RegEx looks like a random garble of characters at first glance. In reality, it is a carefully constructed set of rules to dictate a pattern match on a string. As a primer, ...

How to use VBA to validate data entered in a Word UserForm Your email has been sent Avoid input errors when soliciting data via a Word UserForm with VBA procedures that check for specific attributes.