Is your password confirmation from field named

password_confirmation

?

<div class="col-md-offset-4 col-md-4">

    @include('public.errors')

    {{ Form::open(['route' => 'user_register_path']) }}

    <!-- Username -->
    <div class="form-group">
        {{ Form::label('username', 'Username:') }}
        {{ Form::text('username', null, ['class' => 'form-control']) }}
    </div>

    <!-- Email -->
    <div class="form-group">
        {{ Form::label('email', 'Email:') }}
        {{ Form::text('email', null, ['class' => 'form-control']) }}
    </div>

    <!-- Password -->
    <div class="form-group">
        {{ Form::label('password', 'Password:') }}
        {{ Form::password('password', ['class' => 'form-control']) }}
    </div>

    <!-- Password Confirmation -->
    <div class="form-group">
        {{ Form::label('password_confirmation', 'Password Confirmation:') }}
        {{ Form::password('password_confirmation', ['class' => 'form-control']) }}
    </div>

    <div class="form-group">
        {{ Form::submit('Register', ['class' => 'btn btn-primary']) }}
    </div>

    {{ Form::close() }}
</div>

Try this

$validator = Validator::make(Input::only('username', 'email', 'password','password_confirmation'), $rules);

Thanks so much! Now worked perfect.