Juniper IP SERVICES - CONFIGURATION GUIDE V 11.1.X, Configuration Manual

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Regular Expression Examples
Table 6 on page 47 lists some representative regular expressions that you might use
in an AS-path access list or community list, along with sample attribute values that
match or do not match the regular expression.
Table 6: Sample Regular Expressions
Example
Matched AS-Path or Community
Attribute Regular
Expression
12 23 4212 629
121245 19
but not
58 12 7
Begins with 12 ^12
44 73 465 69
8
but not
1145 1912
2 49
Includes any numeral except 1 or 2 [^12]
89 611 305305
42 30519 1305
6666:305 Ends with 305 305$
89 611 3533 252 12 998
600:500 Includes any one character followed by
the numeral 5 .5
179 35 2433 252 129 48
2129 14600:2129
321:94 Includes a sequence of three characters,
where the first character is numeral 1
and the third character is numeral 9 1.9
Includes any character; matches all AS
paths and community lists .*
67 42 51314
33 252 422 483142
4 339 7831422 Includes a number that has a numeral
4 followed by
zero or more instances of
the numeral 2
42*
137 42 211373737 29 4
1
but not
4 3737 78
Includes a sequence that has a numeral
1 followed by
zero or more instances of
the pattern 37
1(37)*
67 42 2133 252 422 48
but not
4 329 78
Includes a number that has a numeral
4 immediately followed by
one or more
instances of the numeral 2
42+
Using Regular Expressions
■ 47
Chapter 1: Configuring Routing Policy