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12-89
Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance
OL-26645-02
Chapter 12 Configuring Traffic Policies
Configuring Rules and Actions for Policy Maps
Special Characters for Matching String Expressions
Table 12-33 identifies the special characters that can be used in matching string expressions. Use
parenthesized expressions for dynamic replacement using %1 and %2 in the replacement pattern.
Note When matching data strings, note that the period (.) and question mark (?) characters do not have a literal
meaning in regular expressions. Use brackets ([]) to match these symbols (for example, enter
www[.]xyz[.]com instead of www.xyz.com). You can also use a backslash (\) to escape a dot (.) or a
question mark (?).
Related Topics
Configuring Traffic Policies, page 12-1
Configuring Virtual Context Class Maps, page 12-8
Configuring Virtual Context Policy Maps, page 12-34
Configuring Real Servers, page 6-5
Table 12-33 Special Characters for Matching String Expressions
Convention Description
. One of any character.
.* Zero or more of any character.
\. Period (escaped).
\xhh Non-printable character.
[charset] Match any single character from the range.
[^charset] Do not match any character in the range. All other characters represent
themselves.
() Expression grouping.
expr1 | expr2 OR of expressions.
(expr)* 0 or more of expression.
(expr)+ 1 or more of expression.
.\a Alert (ASCII 7).
.\b Backspace (ASCII 8).
.\f Form-feed (ASCII 12).
.\n New line (ASCII 10).
.\r Carriage return (ASCII 13).
.\t Tab (ASCII 9).
.\v Vertical tab (ASCII 11).
.\0 Null (ASCII 0).
.\\ Backslash.
.\x## Any ASCII character as specified in two-digit hexadecimal notation.
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