BGP AS-PATH REGULAR EXPRESSION ASSISTANCE

Question

Hi all,
I'm trying to create an IOS as-path filter that is asdot+ compatible and that only allows a maximum of 3 as-paths, without taking into considerations any prepends that may appear in the as-path.
The following example illustrates what I'm after (3 x AS-PATH: AS777, AS3.157 and AS75):
777 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 75
The following as-path filter will work -- 
ip as-path access-list 200 permit ^(777_)+([0-9]+)|([0-9]+\.[0-9]+)*$
however it will also accept any ASes that are possibly behind AS75, AS76 for example:
777 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 75 76
What I'm looking for is therefore a way of 
1.  providing support for asdot+ in an IOS as-path filter
2.  allowing a maximum of 3 AS-PATHS into my AS from a NAP
3.  Ignore prepends and only count them as a single AS.
In IOS-XR/Juniper terms, I'm trying to replicate the as-path unique-length ge 3 in an IOS as-path.
Doing this in an peer specific inbound route-map is probably easier if your IOS version supports the unique-length option, however this is a valid solution only when you have a few, but not when you have several hundred.  
Can anyone think of a way of doing this?
Kind regards,
Andrew

Answer 1

I haven't tested this, but have you tried removing the * at the end an specify 75 instead?
From:
ip as-path access-list 200 permit ^(777_)+([0-9]+)|([0-9]+\.[0-9]+)*$
To:
ip as-path access-list 200 permit ^(777_)+([0-9]+)|([0-9]+\.[0-9]+)_75$
HTH,
John