Encapsulated match if

[John Hascall]

> Or just had this stroke of inspiration using execute to run an external
> command:
>   match if execute("expr",
>     binary-to-ascii(10, 8, "-", option dhcp-parameter-request-list),
>     ":", ".*-67");

   I think that will fail should option 67 be the first or only
   item in dhcp-parameter-request-list (which is probably unlikely).
   Replacing ".*-67"
        with ".*[^0-9]*67[^0-9]*"
   would be 'more' correct.

John
PS, sounds like a 'requested' operator similar to the 'exists' operator
    would be a nice feature for some future version...