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130 Barracuda Spam Firewall Administrator’s Guide
Using Special Characters in Expressions
The following characters have a special meaning in regular expressions and should be prepended by
a backward slash ( \ ) when you want them interpreted literally:
Examples
Table 1.3 provides some examples to help you understand how regular expressions can be used.
\s Space character: shortcut for [ \n\r\t]
\S Non-space character: shortcut for [^\s]
Miscellaneous
^ Beginning of line
$ End of line
\b Word boundary
\t Tab character
Table 1.2: Special Characters
. $
[(
] )
\|
*^
?@
Table 1.3: Regular Expressions
Example Matches...
viagra viagra, VIAGRA or vIaGRa
d+ One or more digits: 0, 42, 007
(bad|good) letters 'bad' or matches the letters 'good'
^free letters 'free' at the beginning of a line
v[i1]agra viagra or v1agra
v(ia|1a)gra viagra or v1agra
v\|agra v|agra
v(i|1|\|)?agra vagra, viagra, v1agra or v|agra
Table 1.1: Common Regular Expressions
Expression Matches...
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