| Description | The object contains a regular expression.
Regular Expressions:
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A regular expression is a pattern (a phrase, number, or more
complex pattern):
Regular expressions are case sensitive and allow for complex
matching requirements. Simple regular expressions include
entries like Serial, misses, or 138.
Complex regular expressions include entries like 00210... ,
(is ), or [Oo]utput.
Some Practical examples of regular expressions:
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The examples correspond with the various ways that you can
use regular expressions in your configurations.
For example, syslog messages on IOS look as follows:
a.
--
2004 Jul 21 13:26:55 %SYS-5-REDUNDANTCLOCK_OK: Redundant
clock recovered
b.
--
2004 Jul 21 13:26:59 %SYS-5-REDUNDANTCLOCK_FAIL: Redundant
clock failed
c.
--
2004 Jul 26 16:53:47 %MGMT-5-LOGIN_FAIL:User failed to log
in from 171.69.48.75 via Telnet - max attempt reached
A pattern of REDUNDANTCLOCK.* would cause all the syslogs
with severity greater than specified by
ccmProfileAlertGroupSeverity
and having a pattern REDUNDANTCLOCK followed by
REDUNDANTCLOCK followed by any number of occurrences (*)
of any character (.) resulting in corresponding Call Home
messages being generated for syslog alert group.
So both messages a and b in above examples will be resulting
in issuance of Call Home messages for the pattern
REDUNDANTCLOCK.*.
Next, a pattern of ^Telnet would cause all the syslogs
with severity greater than specified by
ccmProfileAlertGroupSeverity and having a string starting
and with Telnet resulting in corresponding Call Home
messages being generated for syslog alert group.
A pattern of LOGIN_FAIL$ would cause all the syslogs with
severity greater than specified by
ccmProfileAlertGroupSeverity and having a string ending in
LOGIN_FAIL resulting in corresponding Call Home messages
being generated for syslog alert group. |