title: Detect missing attributes from HTML element - Regular Expression
body: <p>I have a directory of HTML files, and would like to find out all the  elements that have a missing 'id' attribute.</p>
  
  <p>I figure using a text editor combined with regular expressions would best work.</p>
  
  <p>Im currently stuck with this: <code>&lt;div[^&gt;]*id</code> which would list down all the div elements with id attributes. How would I detect those without them?</p>
  
  <p>Thanks!</p>