Bgp filtering

Hi all. Tell me please how should I write filtern of bgpmask in the birdc ? I want to write something like: bird> show route table testtable where bgp_path ~ /? 65260 ?/ But when I typing the "?" birdc gives me the help :-). Please tell me how to see full bgp_path or give me some examples with it inputs and outputs. What should I type in birdc to see all routes in table testtable which have 65260 in their bgp_path for example ? I suspect that is possible :-). P.S. I don't anderstand BGP very good :-(.