# BGP Regular Expressions Examples **URL:** https://forum.networklessons.com/t/bgp-regular-expressions-examples/1017 **Category:** Lessons Discussion **Created:** [December 26, 2016, 6:13pm UTC](https://forum.networklessons.com/t/bgp-regular-expressions-examples/1017 "2016-12-26T18:13:11Z") **Posts on this page:** 1 **Showing post:** 6
### Author: ![wilder7bc](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/wilder7bc/32/1187_2.png) [@wilder7bc](https://forum.networklessons.com/u/wilder7bc) #### Post date: [May 19, 2018, 8:12pm UTC](https://forum.networklessons.com/t/bgp-regular-expressions-examples/1017/6 "2018-05-19T20:12:04Z")
Is it abnormal not really to be real fluent with these? Don’t get me wrong I see the examples and as I went through lessons later on I see some of the examples come up that can be useful. I am good with ones like: ^$ which can be useful for applying to everything (you use this one when dealing with Transit issues when multi-homing and need to filter) or ^63100$ apply to an AS specifically. I also get and like the ones like ![Capture](https://cdn-forum.networklessons.com/uploads/default/original/1X/ba8410b24c63f01693bd194e49f4b85b377d378c.PNG) which would give every AS that goes through AS 51 those are cool. (I had to take a picture and upload because could not figure out how to use the underscores in posting on the forums is there a trick to that?) Even the more complex examples I could use but I am not getting this like I can start coding with it or something I am understanding it on the level that I can login to this site to get something I need or perhaps google it and search for something I need (minus the simple ones that I used at beginning those stuck) is that ok? or do I really need to drill on these or just understand what they are used for in searches and filters and know that I can look these up when I need? Also do these Regular Expressions just deal with BGP AS? I have touched upon these in Microsoft PowerShell as well though they applied to everything but was used for similar purpose of searches or filters and such. --- _[View the full topic](https://forum.networklessons.com/t/bgp-regular-expressions-examples/1017)._