I think your best bet is making a custom validation rule.
php artisan make:rule EmailMustHaveTLD
EmailMustHaveTLD.php
<?php
namespace App\Rules;
use Illuminate\Contracts\Validation\Rule;
class EmailMustHaveTLD implements Rule
{
/**
* Create a new rule instance.
*
* @return void
*/
public function __construct()
{
//
}
/**
* Determine if the validation rule passes.
*
* @param string $attribute
* @param mixed $value
* @return bool
*/
public function passes($attribute, $value)
{
if (! strpos($value, '@')) {
return;
}
$domain = explode('@', $value)[1];
$hasTLD = !! strpos($domain, '.');
return $hasTLD;
}
/**
* Get the validation error message.
*
* @return string
*/
public function message()
{
return 'E-mail must have a TLD';
}
}
In your controller:
use App\Rules\EmailMustHaveTLD;
public function store(Request $request)
{
$request->validate([
// ...
'email' => ['required', 'email', new EmailMustHaveTLD],
//...
]);
}