Citrix Systems 9.2 Benutzerhandbuch

show policy patset pattern_name 

Where patternName is the name of a pattern that you want to view.

4.

Configure the pattern set as part of an expression.

For example, you can configure it in a policy rule. For more information, 
see 

. Following is 

an example that uses the pattern set myPatSet, and returns TRUE if the 
value of the HTTP header named myHeader contains any of the strings that 
you defined earlier in this procedure:

In addition to matching text with a set of patterns, you can define an arbitrary 
pattern that uses wildcards. In most types of expressions, you should avoid using 
wildcards. For example, the following expression is legal but may have 
unexpected results:

http.req.url.path.contains(

"

/*.jpeg

"

)

Note that this expression would not, for example, match the following URL:

http://10.102.58.201/icon.jpeg 

Following is an example of a regular expression that matches a URL that contains 
the file name suffix, “.jpeg”:

http.req.url.regex_match(re/*.jpeg/) 

In general, for simple pattern matching, it is preferable to use the CONTAINS or 
EQ operation to perform a partial string match. For example, the following 
expressions check the file name extension:

http.req.url.suffix.contains(

"

jpeg

"

)

http.req.url.suffix.eq(

"

jpeg

"

)

However, if you need to match more complex patterns in text, you can define a 
regular expression. For example, the following example selects "text" from "text/
plain":

http.res.header("content-type").before_regex(re#/#)

The NetScaler supports regular expression syntax as described on the following 
Web site:

http://www.pcre.org/pcre.txt

For an introduction to regular expressions, see the following URLs: