ScanMail comes with a set of predefined expressions. These expressions cannot be modified or deleted.

ScanMail verifies these expressions using pattern matching and mathematical equations. After ScanMail matches potentially sensitive data with an expression, the data may also undergo additional verification checks.

For a complete list of predefined expressions, see http://docs.trendmicro.com/en-us/enterprise/data-protection-reference-documents.aspx.