Check bgp_path.len without some AS

[Xavier Trilla]

Hi,

For some route selection configurations I need to check the bgp_path.len 
without some AS numbers.

I tried something like:

bgp_path.delete(AS_1);
bgp_path.delete(AS_2);

if bgp_path.len < N then ...

But doing this I modify permanently the AS path.

I've tried using a temp variable, but looks like bird doesn't allow to create 
bgppath "variables".

Any ideas about how this could be achieved?

Thanks!
Xavier