how to make custom validator in laravel

1generate a new rule object, by using the make:rule Artisan command.
2  Let's use this command to generate a rule that verifies a string is 
3  uppercase. Laravel will place the new rule in the app/Rules directory.
4  If this directory does not exist, Laravel will create it when you 
5  execute the Artisan command to create your rule:
6  
7  php artisan make:rule Uppercase
8  
9  go to https://laravel.com/docs/8.x/validation#custom-validation-rules
10  for details