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$this->validate($request, [
    'username' => 'required|min:3|max:20'
]);

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Validator::extend('my_password', function ($attribute, $value, $parameters, $validator) {
    return preg_match('/^(?=.*[a-z])(?=.*[A-Z])(?=.*d)(?=.*(_|[^w])).+$/', $value) &&
        strlen($value) >= 8 && strlen($value) <= 20;
});

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$this->validate($request, [
    'username' => 'required|min:3|max:20',
    'password' => 'required|my_password'
]);

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$messages = [
    'my_password' => 'The password must contain upper and lowercase letters, numbers, and special symbols. Its length must be between 8 and 20 characters.'
];

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$this->validate($request, [
    'password' => 'required|my_password'
], $messages);

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