Citrix Systems 9.2 - page 220

206 Citrix NetScaler Policy Configuration and Reference Guide
field and the header type for which you want to match the string in the
Header Name text box.
7. Click OK.
8. To create a compound expression, click Add. Note that the type of
compounding that is done depends on the following choices on the Create
Policy dialog box:
•Match Any Expression. The expressions are in a logical OR
relationship.
•Match All Expressions. The expressions are in a logical AND
relationship.
•Tabular Expressions. Click the AND, OR, and parentheses buttons
to control evaluation.
•Advanced Free-Form. Enter the expressions components directly in
the Expression field, and click the AND, OR, and parentheses
buttons to control evaluation.
To create a classic policy expression using the NetScaler command line
1. Start the policy as described in “To create a classic policy using the
NetScaler command line,” on page 202.
add feature policy name -rule expression -action action
2. For expression, substitute a classic expression that defines the
connections you want to match using this policy. This regular expression
can take many forms, but all follow this syntax:
"<flow
type>.<protocol>.<qualifier>.<operator>[.<value>][.<header
name>]"
Note: All rules must be enclosed in double quotes.
For each of the designated elements, you substitute the appropriate value.
The following list describes each element and provides the right values or
explains how to determine what they are:
•Flow type. Whether the policy filters requests or responses.
The flow type can be either REQ or RES for Access Gateway or SSL
policies. For Application Firewall policies, it is always REQ, because
the Application Firewall filters each request and its associated
response as a unit.