. Any single character, including a space
* Zero or more sequence of pattern
+ One or more sequence of pattern
? Zero or one occurrence of pattern
A Beginning of string
$ End of string
_ Match any delimiter (including beginning, end, space, tab, comma)
\ Remove special meaning of character that follows
[ ] Match one character in a range
| Logical OR
The figure lists the most commonly used characters in expressions.
3-28 Configuring BGP on Cisco Routers (BGP) v3.2 © 2005, Cisco Systems, Inc.
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