IPV6DoubleColon example

        if ($colons === false) {
            // We need exactly the right number of groups             if ($groupCount !== $maxGroups) {
                $this->warnings[IPV6GroupCount::CODE] = new IPV6GroupCount();
            }
            return;
        }

        if ($colons !== strrpos($IPv6, '::')) {
            $this->warnings[IPV6DoubleColon::CODE] = new IPV6DoubleColon();
            return;
        }

        if ($colons === 0 || $colons === (strlen($IPv6) - 2)) {
            // RFC 4291 allows :: at the start or end of an address             //with 7 other groups in addition             ++$maxGroups;
        }

        if ($groupCount > $maxGroups) {
            $this->warnings[IPV6MaxGroups::CODE] = new IPV6MaxGroups();
        }