HTML Purifier strip elements with a certain attribute

Question

Is there anyway to make HTML Purifier strip elements with a certain attribute.

I'm using HTML Purifier to clean up a full webpage into just its basic content so I can index and search it.

I want to be able to add an attribute like data-no-index to some wrapper to make them ignored.

This is my HTML Purifier setup:

$config = HTMLPurifier_Config::createDefault();
$config->set('HTML.Allowed', 'h1,h2,h3,h4,h5,h6,p,a[href],ul,ol,li,img[src]');
$purifier = new HTMLPurifier($config);