Cisco 500 Series, Configuration Manual

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Cisco Security Appliance Command Line Configuration Guide
OL-12172-03
Chapter 21 Using Modular Policy Framework
Configuring Special Actions for Application Inspections
hostname(config)# regex name regular_expression
Where the name argument can be up to 40 characters in length.
The regular_expression argument can be up to 100 characters in length.
The following example creates two regular expressions for use in an inspection policy map:
hostname(config)# regex url_example example\.com
hostname(config)# regex url_example2 example2\.com
Creating a Regular Expression Class Map
A regular expression class map identifies one or more regular expressions. You can use a regular
expression class map to match the content of certain traffic; for example, you can match URL strings
inside HTTP packets.
To create a regular expression class map, perform the following steps:
Step 1
Create one or more regular expressions according to the “Creating a Regular Expression” section.
Step 2 Create a class map by entering the following command:
hostname(config)# class-map type regex match-any class_map_name
hostname(config-cmap)#
Where class_map_name is a string up to 40 characters in length. The name “class-default” is reserved.
All types of class maps use the same name space, so you cannot reuse a name already used by another
type of class map.
The match-any keyword specifies that the traffic matches the class map if it matches at least one of the
regular expressions.
The CLI enters class-map configuration mode.
Step 3 (Optional) Add a description to the class map by entering the following command:
hostname(config-cmap)# description string
Step 4
Identify the regular expressions you want to include by entering the following command for each regular
expression:
hostname(config-cmap)#
match regex
regex_name
The following example creates two regular expressions, and adds them to a regular expression class map.
Traffic matches the class map if it includes the string “example.com” or “example2.com.”
hostname(config)# regex url_example example\.com
hostname(config)#
regex url_example2 example2\.com
hostname(config)# class-map type regex match-any URLs
hostname(config-cmap)# match regex url_example
hostname(config-cmap)#
match regex url_example2