User Interface
R&S
®
GP-E/GP-S
28User Manual v16.2.1 ─ 01
Checkbox/Field Description
"Left Anchor"/
"Right Anchor"
Anchors define which boundary is set before (left anchor) or after (right anchor)
the search string. The decoder will search for the "Expression" (preceded or fol-
lowed by the chosen boundary) in the header field selected under "Option" .
Both drop-down lists contain the following options:
●
any – does not define any boundary for the chosen anchor; if both anchors
are set to any, the expression may match anywhere in the content
●
string – specifies a boundary at the beginning (left anchor) or the end
(right anchor) of the content; if both anchors are set, the expression only
matches when it equals the entire content
●
word – specifies the PCRE word boundary; if both anchors are set to
word, the expression matches when it is found in the content surrounded
by word boundaries
Note: Letters, digits and underscores in search strings are treated as word
characters (equivalent to the character classes [:word:], \w and
[A-Za-z0-9_]. All other characters are treated as word boundaries.
"Case Sensitive" When this checkbox is selected, traffic will only match if it contains the specified
expression in the exact case entered.
Setting the "Type" option and both anchors to string will only match if the specified
search term exactly matches the entire content field.
When the "Type" option is set to number, the following options can be defined.
Field Description
"Operator" Determines the relationship between the numeric value entered in the "Expres-
sion" field and the value(s) that appear(s) in the content.
Possible values include:
●
< (less than),
●
> (greater than),
●
<= (less or equal),
●
>= (greater or equal),
●
== (equal),
●
!= (not equal),
●
|| (bitwise or), and
●
&& (bitwise and).
When the "Type" option is set to hash, the rule matches when the exact search string
entered in the "Expression" field is found in traffic. For example, if the target search
expression is specified as www.facebook.com, the rule would not match if a user
were to visit www.facebook.de.
The hash "Type" is equivalent to setting the "Type" option and both anchors to
string and selecting the "Case Sensitive" option, but the search runs much faster.
When the "Type" option is set to regex, the "Expression" is treated as a Perl-Compati-
ble Regular Expression (PCRE) and the following additional options are available as
checkboxes.
Firewall Rule Settings
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