Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
OL-27596 -01
Chapter 1 Command-Line Interface
Using the CLI String Search
Alternation
Alternation allows you to specify alternative patterns to match against a string. You separate the
alternative patterns with a vertical bar (|). Exactly one of the alternatives can match the string. For
example, the regular expression
codex | telebit
matches the string codex or the string telebit, but not both codex and telebit.
Anchoring
You can match a regular expression pattern against the beginning or the end of the string. That is, you
can specify that the beginning or end of a string contains a specific pattern. You “anchor” these regular
expressions to a portion of the string using the special characters shown in Table 1-6.
This regular expression matches a string only if the string starts with abcd:
^abcd
In contrast, this expression is in a range that matches any single letter, as long as it is not the letters a,
b, c, or d:
[^abcd]
With this example, the regular expression matches a string that ends with .12:
$\.12
Contrast these anchoring characters with the special character underscore (_). The underscore matches
the beginning of a string (^), the end of a string ($), parentheses ( ), space ( ), braces { }, comma (,), or
underscore (_). With the underscore character, you can specify that a pattern exist anywhere in the string.
For example:
_1300_
matches any string that has 1300 somewhere in the string. The string’s 1300 can be preceded by or end
with a space, brace, comma, or underscore. For example:
{1300_
matches the regular expression, but 21300 and 13000 do not.
Using the underscore character, you can replace long regular expression lists, such as the following:
^1300$ ^1300(space) (space)1300 {1300, ,1300, {1300} ,1300, (1300
with
_1300_
Table 1-6 Special Characters Used for Anchoring
Character Description
^ Matches the beginning of the string.
$ Matches the end of the string.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E