Foundry Switch and Router Installation and Configuration Guide
19 - 54
December 2000
^
A caret (when not used within brackets) matches on the beginning of an
input string. For example, the following regular expression matches on an
AS-path that begins with “jlampa”:
^jlampa
$
A dollar sign matches on the end of an input string. For example, the
following regular expression matches on an AS-path 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 on an AS-path 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 on
an AS-path 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.
|
A vertical bar (sometimes called a pipe or a “logical or”) separates two
alternative values or sets of values. The AS-path can match one or the
other value. For example, the following regular expression matches on an
AS-path that contains either “abc” or “defg”:
(abc)|(defg)
Note
: The parentheses group multiple characters to be treated as one
value. See the following row for more information about parentheses.
Table 19.2: BGP4 Special Characters for Regular Expressions (Continued)
Character
Operation
Summary of Contents for Switch and Router
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