Create customized expressions if none of the predefined expressions meet
the company's requirements.
Expressions are a powerful string-matching tool. Become comfortable with
expression syntax before creating expressions. Poorly written expressions can dramatically
impact
performance.
When creating expressions:
-
Refer to the predefined expressions for guidance on how to define valid expressions. For example, when creating an expression that includes a date, refer to the expressions prefixed with "Date".
-
Start with simple expressions. Modify the expressions if they are causing false alarms or fine tune them to improve detections.
Administrators can choose from several criteria when creating expressions. An
expression must satisfy the chosen criteria before Data Loss Prevention subjects it
to a DLP
policy. For details about the different criteria options, see Criteria for custom expressions.