Laravel Validation: Custom Rules

php artisan make:rule Uppercase

class Uppercase implements ValidationRule
{
    public function validate(string $attribute, mixed $value, Closure $fail): void
    {
        if (strtoupper($value) !== $value) {
            $fail('The :attribute must be uppercase.');
        }
    }
}

$request->validate([
    'name' => ['required', new Uppercase],
]);

'email' => [
    function ($attribute, $value, $fail) {
        if (!str_ends_with($value, '@company.com')) {
            $fail('Must be a company email.');
        }
    },
],