an ip address should have 3 dot and 2 (IPv4)
so ii you check for the number of dot you have you will remove some false
guess
Pierre
>From: drieux <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: Re: checking if domain or IP address
>Date: Tue, 30 Apr 2002 18:07:21 -0700
>
>
>On Tuesday, April 30, 2002, at 05:51 , David Ulevitch wrote:
>[..]
>> I was just checking to see if the first char was a number or a digit
>> but there are some cases where a hostname can start with a number.
>> (like 3.14159.com for example)
>>
>> So the question is, if I have a variable like $nameserver
>> how can I test to see if it's a hostname or an IP?
>
>how about:
>
> the premise is that 'hostnames' in your example are what
> we would call fully qualified 'network names' - I of course
> do not deal with resolving the 'bob' - but that would be
> where you would want to do the
>
> perldoc -f gethostbyname
>
>to check if these are valid hostnames ...
>
>### #!/usr/bin/perl -w
>### use strict;
>###
>### # ipaddr_or_hostname.pl- is for
>###
>### my @whatAreThese = qw/ 3.14159.com 192.168.2.1 wetware.com bob/;
>### my $type;
>###
>### foreach my $nameserver (@whatAreThese) {
>### if ( $nameserver =~ m/\.[a-zA-Z]+$/ ) {
>### $type = "possible Hostname";
>### }elsif ($nameserver =~ m/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/){
>### $type = "possible IP_ADDR";
>### }else{
>### $type = "UNK"
>### }
>###
>### print "It appears that $nameserver is a $type\n";
>### }
>###
>### =cut
>### which gens:
>### It appears that 3.14159.com is a possible Hostname
>### It appears that 192.168.2.1 is a possible IP_ADDR
>### It appears that wetware.com is a possible Hostname
>### It appears that bob is a UNK
>### =cut
>###
>### # end of the world as I knew it [EMAIL PROTECTED] all rights reserved
>### # ginned On 30-Apr-02
>### #
>###
>
>ciao
>drieux
>
>---
>
>
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