This is what I came up with (lifted out of a bit of production code). 

    die "Bad IP address '$ip'\n" unless $ip
        && $ip =~ /^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/
        && !grep { $_ < 0 || $_ > 255 } split(/\./, $ip);

[download]

Perhaps not the most elegant solution but readable and tested!

In reply to RE: Matching an IP address by ncw
in thread Matching an IP address by bort13

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