Extreme Networks ExtremeSwitching CES 2000 Series Hardware Installation Manual page 66

CLI Functionality
TABLE 12 Special characters for regular expressions (continued)
Character
+
?
^
$
_
[ ]
66
Operation
The plus sign matches on one or more sequential instances of a pattern.
For example, the following regular expression matches output that
contains "de", followed by a sequence of "g"s, such as "deg", "degg",
"deggg", and so on:
deg+
The question mark matches on zero occurrences or one occurrence of a
pattern.
For example, the following regular expression matches output that
contains "dg" or "deg":
de?g
NOTE
Normally when you type a question mark, the CLI lists the
commands or options at that CLI level that begin with the
character or string you entered. However, if you enter Ctrl-V
and then type a question mark, the question mark is inserted
into the command line, allowing you to use it as part of a
regular expression.
A caret (when not used within brackets) matches on the beginning of an
input string.
For example, the following regular expression matches output that begins
with "deg":
^deg
A dollar sign matches on the end of an input string.
For example, the following regular expression matches output that ends
with "deg":
deg$
An underscore matches on one or more of the following:
• , (comma)
• { (left curly brace)
• } (right curly brace)
• ( (left parenthesis)
• ) (right parenthesis)
• The beginning of the input string
• The end of the input string
• A blank space
For example, the following regular expression matches on "100" but not
on "1002", "2100", and so on:
_100_
Square brackets enclose a range of single-character patterns.
For example, the following regular expression matches output that
contains "1", "2", "3", "4", or "5":
[1-5]
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