REGEX Examples
_100_ - Passes/passed through AS 100
^100$ - Directly connected to AS 100 (begins and ends in AS 100
_100$ - Originated in AS 100
^100_ - Networks behind AS 100
^[0-9]+$ - AS Paths that is one AS long
^([0-9]+)(_\1)*$ - Networks originating in neighboring AS, with possible prependings
^$ - Networks originating in LOCAL AS
.* - Matches everything
Understanding BGP Regular Expressions
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