BGP Routing table view

I have struggled with learning how to use regular expressions. These are useful when creating ip as-path access-lists to filter or permit traffic from certain BGP AS's.

After watching a Internetwork expert Class on Demand, I learned there is a tool anyone can telnet to. Basically you can just telnet to route-views.routeviews.org. You can get a current view of the size of the current full internet routing table as seen below:

route-views.oregon-ix.net>sh ip bgp sum
BGP router identifier 128.223.51.103, local AS number 6447
BGP table version is 4872374, main routing table version 4872374
328870 network entries using 43410840 bytes of memory
10002703 path entries using 520140556 bytes of memory
1661334/58620 BGP path/bestpath attribute entries using 279104112 bytes of memory
1437779 BGP AS-PATH entries using 55658958 bytes of memory
21404 BGP community entries using 1369574 bytes of memory
60 BGP extended community entries using 7574 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 899691614 total bytes of memory
Dampening enabled. 1853 history paths, 4492 dampened paths
BGP activity 404599/70395 prefixes, 18008013/7986902 paths, scan interval 60 secs

Thats a whole lot of routes!