Multiple rel attributes
<p>How would Google behave if encounter with a link having two different <code>rel</code> attribute?  </p>

<pre><code>&lt;a href="example.com" rel="follow" rel="nofollow"&gt;hello&lt;/a&gt;
</code></pre>

<p>I'm trying to purge content user insert into DB. I need to prevent user from making links as follow for search engines, but I'm not going to do it for internal links so I can't use meta in header to prevent all links from following. So if a user has added <code>rel</code> attribute manually I would have the new link with two <code>rel</code> like above example. I use <a href="https://stackoverflow.com/a/2452743/4061644">this method</a> for making my regex.</p>