Custom Validation Rules: Using Rule Objects

Php artisan make:rule Uppercase

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class Uppercase implements Rule
{
    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        return strtoupper($value) === $value;
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'The :attribute must be uppercase.';
    }
}

/**
 * Get the validation error message.
 *
 * @return string
 */
public function message()
{
    return trans('validation.uppercase');
}

Use App\Rules\Uppercase;

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