Citrix Systems 9.2 Manual Do Utilizador
Chapter 4 Advanced Expressions: Evaluating Text
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In the preceding examples, the contains operator permits a partial match and
the eq operator looks for an exact match.
the eq operator looks for an exact match.
Other operations are available to format the string before evaluating it, for
example, to strip out quotes and white spaces, to convert the string to all
lowercase, or to concatenate strings.
example, to strip out quotes and white spaces, to convert the string to all
lowercase, or to concatenate strings.
Note:
Complex operations are available to perform matching based on patterns
or to convert one type of text format to another type. For more information, see
.
Compounding and Precedence in Text
Expressions
You can apply various operators to combine text prefixes or expressions. For
example, the following expression concatenates the returned values of each
prefix:
example, the following expression concatenates the returned values of each
prefix:
http.req.hostname + http.req.url
Following expression is an example of forming a compound text expression that
uses a logical AND. In this example, both components of the expression must be
TRUE for a request to match the expression:
uses a logical AND. In this example, both components of the expression must be
TRUE for a request to match the expression:
http.req.method.eq(post) && http.req.body(1024).
startswith("destination=")
Note:
For more information on operators for compounding, see
.
Categories of Text Expressions
The primary categories of text expressions that you can configure are:
•
Information in HTTP headers, HTTP URLs, and the POST body in HTTP
requests.
requests.
For more information, see
.
•
Information regarding a VPN or a clientless VPN.
For more information, see
•
TCP payload information.