Cisco Cisco Web Security Appliance S190 Guía Del Usuario
Chapter 16 URL Filters
Regular Expressions
16-30
Cisco IronPort AsyncOS 7.0 for Web User Guide
OL-23079-01
Note
You must enclose regular expressions that contain blank spaces or
non-alphanumeric characters in ASCII quotation marks.
non-alphanumeric characters in ASCII quotation marks.
Regular Expression Character Table
describes characters that are commonly used to form regular
expressions:
Table 16-6
Regular Expression Character Descriptions
Character
Description
.
Matches a single character.
*
Matches zero or more occurrences of the preceding regular
expression.
expression.
For example:
[0-9]* matches any number of digits
“.*” matches any arbitrary string of characters
^
Matches the beginning of a line as the first character of a regular
expression.
expression.
$
Matches the end of a line as the last character of a regular
expression.
expression.
+
Matches one or more occurrences of the preceding regular
expression.
expression.
?
Matches zero or one occurrence of the preceding regular
expression.
expression.
|
Matches the preceding regular expression or the following regular
expression. For example:
expression. For example:
x|y matches either x or y
abc|xyz matches either of the strings abc or xyz