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Re: Validating string for FDQN

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Date Tue, 7 Jun 2011 12:50:22 +1000
Subject Re: Validating string for FDQN
From Chris Angelico <rosuav@gmail.com>
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On Tue, Jun 7, 2011 at 10:40 AM, Eric <eric.wong.t@gmail.com> wrote:
> Hello,
>
> Is there a library or regex that can determine if a string is a fqdn
> (fully qualified domain name)? I'm writing a script that needs to add
> a defined domain to the end of a hostname if it isn't already a fqdn
> and doesn't contain the defined domain.

One reliable way to test would be to do a whois check on the name. If
it comes up with something, it's fully qualified.

http://code.google.com/p/pywhois/

Alternatively, if all you want is a simple syntactic check, and if you
can assume that the name is already a valid domain name (no weird
characters, etc), then you can simply divide it on the last dot and
see if the last part is a recognized TLD. A partial list of TLDs can
be found here:

http://data.iana.org/TLD/tlds-alpha-by-domain.txt

There are other TLDs too, including .localhost and .test, which you
can probably ignore.

Chris Angelico

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Thread

Validating string for FDQN Eric <eric.wong.t@gmail.com> - 2011-06-06 17:40 -0700
  Re: Validating string for FDQN harrismh777 <harrismh777@charter.net> - 2011-06-06 20:55 -0500
  Re: Validating string for FDQN Chris Angelico <rosuav@gmail.com> - 2011-06-07 12:50 +1000
  Re: Validating string for FDQN Philip Semanchuk <philip@semanchuk.com> - 2011-06-06 23:10 -0400
  Re: Validating string for FDQN Nobody <nobody@nowhere.com> - 2011-06-07 06:23 +0100
    Re: Validating string for FDQN Chris Angelico <rosuav@gmail.com> - 2011-06-07 15:52 +1000
      Re: Validating string for FDQN Chris Torek <nospam@torek.net> - 2011-06-07 06:20 +0000
      Re: Validating string for FDQN Nobody <nobody@nowhere.com> - 2011-06-07 21:46 +0100

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