Citrix Systems 9.2 manual Configuring a Pattern Set

160 Citrix NetScaler Policy Configuration and Reference Guide

Operators That Compare Text and HTTP Headers With a Pattern Set

Matching Operators	Description
http header.CONTAINS_INDEX	Operates on all the instances of the current header
(pattern_set_name)	type. Evaluates all header values, and returns the
	index of the matching pattern in the pattern set
	name argument that is present in any instance of a
	header value. This operations works with the
	following prefixes:
	•	HTTP.REQ.COOKIE
	• HTTP.REQ.HEADER("header_name")
	• HTTP.RES.HEADER("header_name")
	•	HTTP.RES.SET_COOKIE
	•	HTTP.RES.SET_COOKIE2
text.EQUALS_INDEX(pattern_	Evaluates whether the target is an exact match with
set_name)	any of the strings that are bound to pattern_set_
	name.
	If an exact match is found, this operation returns
	the numerical index of the matching string.
http header.EQUALS_INDEX	Operates on all the instances of the current header
(pattern_set_name)	type. Evaluates all header values and returns the
	index of the matching pattern in the pattern set
	name argument that is present in any instance of a
	header value. This operations works with the
	following prefixes:
	•	HTTP.REQ.COOKIE
	• HTTP.REQ.HEADER("header_name")
	• HTTP.RES.HEADER("header_name")
	•	HTTP.RES.SET_COOKIE
	•	HTTP.RES.SET_COOKIE2

Configuring a Pattern Set

A pattern set contains a name and string patterns. Each string pattern is assigned an index that enables you to select the associated string from the set.

When you configure a pattern set, you can assign index values to the patterns, or you can let the NetScaler assign the index values, as follows:

•When configuring the first pattern in the pattern set, if you omit an index the NetScaler generates an index and issues an error if you specify an index value for any additional patterns in the set.

•If you provide an index for the first pattern in the set, you must provide an index for all subsequent patterns in the set.

Note: Pattern sets are case-sensitive.