Getting Familiar with Management Applications
December 2005 © Foundry Networks, Inc. 2 - 7
? 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]
You can use the following expression symbols within the brackets. These symbols are
allowed only inside the brackets.
• ^ – The caret matches on any characters except the ones in the brackets. For
example, the following regular expression matches output that does not contain “1”,
“2”, “3”, “4”, or “5”:
[^1-5]
• - The hyphen separates the beginning and ending of a range of characters. A match
occurs if any of the characters within the range is present. See the example above.
Table 2.3: Special Characters for Regular Expressions (Continued)
Character Operation
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