> -----Mensaje original-----
> De: de Oliveiros C,
>
> Dear All,
>
> I have a table with host names and some happen to be numeric IPs.
>
> I would like to be able to filter out the later.
>
> Is there any function pre-defined in the system that can test
> a particular text type value to see if it is a numeric ip?
>
> Something that returns true if applied to '192.168.1.1' but
> false if applied to 'videos.sapo.pt' ?
>
> I considered NOT LIKE '%.%.%.%' but I'm affraid it will
> filter out host names like 'www.google.com.br'
>
> I've realized that, for ex, inet 'x.x.x.x' will fail if the
> input is not a numeric IP, is there any simple and direct way
> to somewhat trap that error and convert it to a false value
> that can be used in a WHERE clause?
>
You could filter IP out with a regular expression:
select hostname as hosts_not_ip
from table
where hostname !~ '^[0-9]\.[0-9]\.[0-9]\.[0-9]$'
Cheers,
Fernando.
