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BGP AS-Path Access-list regex query

Nexus SW:-  NXOS: version 7.0(3)I7(6)

This SW has BGP peering with Cloud Vendor 1 , Cloud vendor 2 , Cloud Vendor 3

 

requirement is :-

I would like to advertise routes originated from cloud vendor 1 to cloud vendor 2 and ignore cloud vendor 3 and other AS routes 

 

consider cloud vendor 1 has AS 65000

cloud vendor 2 has 38198

 

configuration:-

ip as-path access-list CV1AS seq 5 permit ^65000$

 

route-map CLV2 permit 10
match as-path CV1AS

 

neighbor <CLV2 neighborIP>

route-map CLV2 out

 

ip as-path access-list CV2AS seq 5 permit ^38198$

 

route-map CLV1 permit 10

match as-path CV2AS

 

neighbor <CLV1 neighborip>

route-map CLV1 out

 

could you some advise if the specified regex permit prefixes which are originated from the given AS Value or It needs to be changed to _AS$

 

Please correct me if I am wrong

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