RewriteRule ^(dashboard(/index)?|index(\.php)?)/?$ / [L,R=301]
RewriteRule ^(.*)/index/?$ $1 [L,R=301]

RewriteCond %{HTTP_HOST} !^(www|jobcareer) [NC]
RewriteRule ^(.*)$ http://www.polibatam.ac.id/$1 [R=301,L]

config.php file

$config['base_url']	= 'http://jobcareer.polibatam.ac.id/';
$config['index_page'] = '';

		$session->userdata('sesblabla')=="")
		{
			redirect('/login/');
		}else{
			$data['base'] = $this->config->item('base_url');
			$this->load->view('dashboard',$data);
		}
	}

	function logout()
	{
		$this->session->sess_destroy();
		redirect('/login/');
	}
}

why still access index.php/dashboard/ ? not /dashboard/