Re: Is there any function to test for numeric ips?

In article <E94D918326D044C69895D829038E31B2(at)marktestcr(dot)marktest(dot)pt>,
"Oliveiros C," <oliveiros(dot)cristina(at)marktest(dot)pt> writes:

> 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 use a regular expression match:

SELECT host
FROM t1
WHERE host ~ '^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$'