Juniper Networks J-Series - Manual (Page 181)

Table 83: Common Regular Expression Operators and the Terms They Match
Matching Terms Regular Expression Operator
One instance of any character except the space.
For example, .in matches messages with win or windows.
. (period)
Zero or more instances of the immediately preceding term.
For example, tre* matches messages with tree, tread or trough.
* (asterisk)
One or more instances of the immediately preceding term.
For example, tre+ matches messages with tree or tread but not trough.
+ (plus sign)
Zero or one instance of the immediately preceding term.
For example, colou?r matches messages with or color or colour.
? (question mark)
One of the terms that appear on either side of the pipe operator.
For example, gre|ay matches messages with either grey or gray.
| (pipe)
Any string except the one specified by the expression, when the exclamation
point appears at the start of the expression. Use of the exclamation point is
specific to JUNOS. ! (exclamation point)
The start of a line, when the caret appears outside square brackets.
For example, ^T matches messages with This line and not with On this line.
^ (caret)
Strings at the end of a line.
For example, :$ matches messages with the following: and not with 2:00.
$ (dollar sign)
One instance of one of the enclosed alphanumeric characters. To indicate a
range of characters, use a hyphen (
- ) to separate the beginning and ending
characters of the range.
For example, [0-9] matches messages with any number.
[] (paired square brackets)
One instance of the evaluated value of the enclosed term. Parentheses are used
to indicate the order of evaluation in the regular expression.
For example, dev(/|ice) matches messages with dev/ or device.
() (paired parentheses)
Before You Begin
Before you begin configuring and monitoring system log messages, complete the
following tasks:
■ Establish basic connectivity. See the Getting Started Guide for your router.
■ Configure network interfaces. See the J-series Services Router Basic LAN and WAN
Access Configuration Guide.
Before You Begin ■ 159
Chapter 8: Monitoring Events and Managing System Log Files