[c-nsp] cisco regex puzzle of the day

[Job Snijders]

Hi all,

On Juniper you can match in a single regular expression, any and all
downstream customers of a peer, but not the peer itself (even prepended)
with the following:
    
    "^64500+ [^64500]"

This junos beauty will match for example: "64500 64500 123 123 444", but
not "64500 64500" or "64500".

Can any of you come up with a single line regex that works on IOS or XR
(ios-regex) to mimick the above described behaviour?

Kind regards,

Job