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Table 9. Special characters for regular expressions (continued)
Character
*
+
?
^
$
_
36
IBM Ethernet Switch c-series Installation and User Guide
Operation
The asterisk matches on zero or more sequential instances of a pattern.
For example, the following regular expression matches output that contains
the string "abc", followed by zero or more Xs:
abcX*
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:
v , (comma)
v { (left curly brace)
v } (right curly brace)
v ( (left parenthesis)
v ) (right parenthesis)
v The beginning of the input string
v The end of the input string
v A blank space
For example, the following regular expression matches on "100" but not on
"1002", "2100", and so on:
_100_
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