Regexp::Common already has a regex for you. Don't stress building your own. 

   use Regexp::Common qw/ net number /;

   # these become available:
   # $RE{net}{IPv6}
   # $RE{net}{IPv4}

   if ( $ip =~ m/$RE{net}{IPv4}/ ){
      print 'match!'
   }

[download]

Neil Watson
watson-wilson.ca

In reply to Re: Validate Ip address Regexp by neilwatson
in thread Validate Ip address Regexp by akr8986

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