Policies and expressions

Last published : Sep 24, 2026
The following topics provide the conceptual and reference information that you require for configuring advanced policies on the NetScaler.
To know about all the advanced policy expressions supported on the NetScaler appliance, see Policy Expressions
Topic Description
Introduction to Policies and Expressions Describes the purpose of expressions, policies, and actions, and how different NetScaler applications make use of them.
Configuring Advanced Policies Describes the structure of advanced policies and how to configure them individually and as policy banks.
Configuring Advanced Expressions: Getting Started Describes expression syntax and semantics, and briefly introduces how to configure expressions and policies.
Advanced Expressions: Evaluating Text Describes expressions that you configure when you want to operate on text (for example, the body of an HTTP POST request or the contents of a user certificate).
Advanced Expressions: Working with Dates, Times, and Numbers Describes expressions that you configure when you want to operate on any type of numeric data (for example, the length of a URL, a client's IP address, or the date and time that an HTTP request was sent).
Advanced Expressions: Parsing HTTP, TCP, and UDP Data Describes expressions for parsing IP and IPv6 addresses, MAC addresses, and data that is specific to HTTP and TCP traffic.
Advanced Expressions: Parsing SSL Certificates Describes how to configure expressions for SSL traffic and client certificates, for example, how to retrieve the expiration date of a certificate or the certificate issuer.
Advanced Expressions: IP and MAC Addresses, Throughput, VLAN IDs Describes expressions that you can use to work with any other client-related or server-related data not discussed in other chapters.
Typecasting Data Describes expressions for transforming data of one type to another.
Regular Expressions Describes how to pass regular expressions as arguments to operators in advanced expressions.
Expressions Reference A reference for advanced expression arguments.
Summary Examples of Advanced Expressions and Policies Examples of advanced expressions and policies, in both quick reference and tutorial format, that you can customize for your own use.
Tutorial Examples of Advanced Policies for Rewrite Examples of advanced policies for use in the Rewrite feature.
Tutorial Examples of Policies Examples of policies for NetScaler features such as application firewall and SSL.
Migration of Apache mod_rewrite Rules to Advanced Policies Examples of functions that were written using the Apache HTTP Server mod_rewrite engine, with examples of these functions after translation into Rewrite and Responder policies on the NetScaler.