A new screen displays.
For example, if you are creating an expression for ID numbers, type a sample ID number. This data is used for reference purposes only and will not appear elsewhere in the product.
Data units follow semantic rules. Not every 9-digit number is a valid social security number and not every 15- or 16-digit number is a valid credit card number. To reduce false positives, expression validators check if the extracted data units follow these rules.
For example, if the expression is for a national ID, type a valid ID number in the Test data text box, click Test, and then check the result.
Save the settings only if the testing was successful. An expression that cannot detect any data wastes system resources and may impact performance.