title: Regular expression to match any word that contain specific letters or more?
body: <p>I need a Regex to match any word that contains letters: <strong>m+a+h+d</strong> together in any order
  so, <strong>Mohamed</strong>, <strong>Hamada</strong> and <strong>Mahmoud</strong> matches, but <strong>hammer</strong> don't match
  I tried do the following (I'm new to the Regex!):</p>
  
  <pre><code>Regex reg=new Regex("[mahd]");
  </code></pre>
  
  <p>But obviously it is not the correct pattern</p>