Citrix Systems 9.2 Selects text that precedes the string that matches, From text/plain, MyExample

166 Citrix NetScaler Policy Configuration and Reference Guide

The following table describes operations that use regular expressions.

Operations That Apply Regular Expressions to Text and HTTP Headers

Regular Expression Operation	Description
text.BEFORE_REGEX(regular	Selects text that precedes the string that matches
expression)	the regular expression argument. If the regular
	expression does not match any data in the target,
	the expression returns a text object of length of 0.
	The following expression selects the string "text"
	from "text/plain".
	http.res.header("content-
	type").before_regex(re#/#)
text.AFTER_REGEX(regular	Selects text that follows the string that matches the
expression)	regular expression argument. If the regular
	expression does not match any text in the target,
	the expression returns a text object of length of 0.
	The following expression extracts "Example" from
	"myExample":
	http.req.header("etag").after_
	regex(re/my/)
text.REGEX_SELECT(regular	Selects a string that matches the regular expression
expression)	argument. If the regular expression does not match
	the target, a text object of length of 0 is returned.
	The following example extracts the string "NS-
	CACHE-9.0: 90" from a Via header:
	http.req.header("via").regex_
	select(re!NS-CACHE-
	\d\.\d:\s*\d{1,3}!)