Pull an IP address from a string of text.

sub extract_ip {
        my $txt = shift();

        # 4 octets surrounded by some word boundary
        if ($txt =~ /\b((\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3}))\b/) {
                if ($2 > 255 || $3 > 255 || $4 > 255 || $5 > 255) { return ''; }

                return $1;
        }

        return '';
}