Create customized expressions if none of
the predefined expressions meet your 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".
-
Note that Data Loss Prevention follows the expression formats defined in
Perl
Compatible Regular Expressions (PCRE). For more information on PCRE, visit the
following website:
-
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 Customized Expression.
