{
  email => qw(required, email),
  age   => qw(integer, min:18),
}

##</code><code>##

{
  required => qw(email), 
  email    => qw(email),
  integer  => qw(age),
  min      => { filed => ‘age’, num => 18 },        
}

##</code><code>##

{
  required   => … ,
  validators => { … }
}

##</code><code>##

 
use Dancer2;
use Dancer2::Plugin::FormValidator;

package RegisterForm {
    use Moo;
    with 'Dancer2::Plugin::FormValidator::Role::Profile';
 
    sub profile {
        return {
            username     => [ qw(required alpha_num_ascii length_min:4 length_max:32) ],
            email        => [ qw(required email length_max:127) ],
            password     => [ qw(required length_max:40) ],
            password_cnf => [ qw(required same:password) ],
            confirm      => [ qw(required accepted) ],
        };
    }
}

post '/form' => sub {
    if (validate profile => RegisterForm->new) {
        my $valid_hash_ref = validated;
 
        save_user_input($valid_hash_ref);
        redirect '/success_page';
    }
 
    redirect '/form';
};