Route Policies
7705 SAR OS Router Configuration Guide 417
Operators
The regular expression operators are listed in Table 61.
Examples of AS path and community string regular expressions are listed in Table 62.
Table 61: Regular Expression Operators
Operator Description
| Matches the term on alternate sides of the pipe
* Matches multiple occurrences of the term
? Matches 0 or 1 occurrence of the term
+ Matches 1 or more occurrence of the term
( ) Used to parenthesize so a regular expression is considered as one term
[ ] Used to demarcate a set of elementary or range terms
- Used between the start and end of a range
{m,n} Matches at least m and at most n repetitions of the term
{m} Matches exactly m repetitions of the term
{m,} Matches m or more repetitions of the term
^ Matches the beginning of the string — only allowed for communities
$ Matches the end of the string — only allowed for communities
\ An escape character to indicate that the following character is a match
criteria and not a grouping delimiter
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