Citrix Systems 9.2 manual Regular Expression Operation Description, Settextmodeignorecase

Chapter 9 Advanced Expressions: String Sets, String Patterns, and Data Formats 167

Operations That Apply Regular Expressions to Text and HTTP Headers

Regular Expression Operation	Description
text.REGEX_MATCH(regular	Returns TRUE if the target matches a regular
expression)	expression argument of up to 1499 characters.
	The regular expression must be of the following
	format:
	re<delimiter>regular expression<
	delimiter>
	Both delimiters must be the same. Additionally, the
	regular expression must conform to the Perl-
	compatible (PCRE) regular expression library
	syntax. For more information, go to http://
	www.pcre.org/pcre.txt. In particular, see the
	pcrepattern man page. However, make note of the
	following:
	• Back-references are not allowed.
	• Recursive regular expressions are not
	recommended.
	• The dot metacharacter also matches new lines.
	• The Unicode character set is not supported.
	• SET_TEXT_MODE(IGNORECASE)
	overrides the “(?i)” internal option specified in
	the regular expression.
	The following are examples:
	http.req.hostname.regex_match(re/
	[[:alpha:]]+(abc){2,3}/)
	http.req.url.set_text_
	mode(urlencoded).regex_
	match(re#(a*b+c*)#)
	The following example matches ab and aB:
	http.req.url.regex_match(re/a(?i)b/)
	The following example matches ab, aB, Ab and
	AB:
	http.req.url.set_text_
	mode(ignorecase).regex_match(re/ab/)
	The following example performs a case-
	insensitive, multiline match where the dot meta-
	character also matches a new line:
	http.req.body.regex_match(re/(?ixm)
	(^ab (.*) cd$) /)