From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2013-01-16T07:31:36+09:00
Subject: Re: regex hostnames?

On Tue, Jan 15, 2013 at 10:26 PM, skolo pen <lists@ruby-forum.com> wrote:
> Not versed in regex, hopefully someone can help me out.
>
> How can I return only the domain from a string like
>
> host[0-9].temp.temp.com
> or
> [0-9]host.temp.com
>
>
> So it only returns "temp.temp.com" or "temp.com". Essentially removing
> the shortname of the host even if there is a range within the shortname.
> I may have additional periods to identify subdomains but there will
> never be a period inside a the shortname of the host.

So you want to remove everything up to the first period?

s = "host1.temp.temp.com"
s[/\..*/,1]

http://ruby-doc.org/core-1.9.3/String.html#method-i-5B-5D

Jesus.