checkIPV4Tag example

if ($this->lexer->current->isA(EmailLexer::S_CLOSEBRACKET)) {
                break;
            }

            $addressLiteral .= $this->lexer->current->value;
        } while ($this->lexer->moveNext());


        //Encapsulate         $addressLiteral = str_replace('[', '', $addressLiteral);
        $isAddressLiteralIPv4 = $this->checkIPV4Tag($addressLiteral);

        if (!$isAddressLiteralIPv4) {
            return new ValidEmail();
        } else {
            $addressLiteral = $this->convertIPv4ToIPv6($addressLiteral);
        }

        if (!$IPv6TAG) {
            $this->warnings[WarningDomainLiteral::CODE] = new WarningDomainLiteral();
            return new ValidEmail();
        }