diffutils: Suggestion for regex based diff

[Jan-Benedict Glaw]

Hi!

For keeping eg. routers conformant to a given template, it would help
to be able to diff an actual config with a file containing only
regexps, like this:

------- config --------------
interface FastEthernet0
  ip address 192.168.1.1
  duplex auto
exit
-----------------------------

------- template ------------
^interface FastEthernet0$
^ ip address [0-9]+\.[0-9]+\.[0-9]+\.[0-9]$
^ duplex auto$
^exit$
-----------------------------

I tried to implement this, but I admit that I basically failed to
really understand how GNU diff works. It would be nice if somebody
could guide me a bit (or implement it if you think it's of real use.)

Thanks,
        Jan-Benedict

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