Cisco FirePOWER ASA 5500 series Configuration Manual page 365

Chapter 21 Using Modular Policy Framework
Table 21-1
Character Description
|
?
*
+
{x}
{x,}
[abc]
[^abc]
[a-c]
""
^
\
char
\r
\n
\t
\f
OL-10088-01
regex Metacharacters (continued)
Alternation
Question mark
Asterisk
Plus
Repeat quantifier
Minimum repeat quantifier
Character class
Negated character class
Character range class
Quotation marks
Caret
Escape character
Character
Carriage return
Newline
Tab
Formfeed
Configuring Special Actions for Application Inspections
Notes
Matches either expression it separates. For example,
dog|cat matches dog or cat.
A quantifier that indicates that there are 0 or 1 of the
previous expression. For example, lo?se matches lse or
lose.
You must enter Ctrl+V and then the question
Note
mark or else the help function is invoked.
A quantifier that indicates that there are 0, 1 or any
number of the previous expression. For example, lo*se
matches lse, lose, loose, and so on.
A quantifier that indicates that there is at least 1 of the
previous expression. For example, lo+se matches lose
and loose, but not lse.
Repeat exactly x times. For example, ab(xy){3}z
matches abxyxyxyz.
Repeat at least x times. For example, ab(xy){2,}z
matches abxyxyz, abxyxyxyz, and so on.
Matches any character in the brackets. For example,
[abc] matches a, b, or c.
Matches a single character that is not contained within
the brackets. For example, [^abc] matches any character
other than a, b, or c. [^A-Z] matches any single
character that is not an uppercase letter.
Matches any character in the range. [a-z] matches any
lowercase letter. You can mix characters and ranges:
[abcq-z] matches a, b, c, q, r, s, t, u, v, w, x, y, z, and so
does [a-cq-z].
The dash (-) character is literal only if it is the last or the
first character within the brackets: [abc-] or [-abc].
Preserves trailing or leading spaces in the string. For
example, " test" preserves the leading space when it
looks for a match.
Specifies the beginning of a line.
When used with a metacharacter, matches a literal
character. For example, \[ matches the left square
bracket.
When character is not a metacharacter, matches the
literal character.
Matches a carriage return 0x0d.
Matches a new line 0x0a.
Matches a tab 0x09.
Matches a form feed 0x0c.
Cisco Security Appliance Command Line Configuration Guide
21-7