title: Rails render wrong match html tag
body: <p>there are some <code>&lt;/div&gt;</code> tag in my post content, so when I render the post body by:</p>
  
  <pre><code>&lt;%= simple_format(post.body) %&gt;
  </code></pre>
  
  <p>The format will be in dreadful disorder.</p>
  
  <p>So how to do is the right way ?</p>