title: Replace Empty span tag to br tag using Regex
body: <p>Can any one tell me the Regex pattern which checks for the empty span tags and replace them with &nbsp; tag.</p>
  
  <p>Something like the below :</p>
  
  <pre><code>string io = Regex.Replace(res,"" , RegexOptions.IgnoreCase);
  </code></pre>
  
  <p>I dont know what pattern to be passed in!</p>