AS Path Regex

Contains a regular expression that checks the AS_PATH of the NLRI. Examples:

• .*_100: filters all NLRIs originating from "AS100".
• .*_(100|200): filters all NLRIs originating from "AS100" or "AS200".
• 100_(.*_)?(500|400)_.*: filters all NLRIs from the BGP neighbor with the AS number "AS100", which were also previously routed via networks with the AS numbers "AS500" or "AS400" (or both).
• 100_(500|400|123)_.*: filters all NLRIs from the BGP neighbor with the AS number "AS100" and which received this number beforehand directly from BGP neighbors with the AS numbers "AS500", "AS400" or "AS123".
• 100_(100_)*(300_)*300: filters all NLRIs from the BGP neighbor with the AS number "AS100" and which received this number beforehand from the BGP neighbor with the AS number "AS300". The expression also allows for AS prepend paths.
• 100_ 200: filters all NLRIs from the BGP neighbor with the AS number "AS100" and which originated from the network with the AS number "AS200". The route taken by the NLRIs from "AS200" to "AS100" is unimportant.