title: Regex for removing only specific special characters from string
body: <p>I'd like to write a regex that would remove the special characters on following basis:</p>
  
  <ul>
  <li>To remove white space character</li>
  <li><code>@</code>, <code>&amp;</code>, <code>'</code>, <code>(</code>, <code>)</code>,  <code>&lt;</code>,  <code>&gt;</code> or <code>#</code></li>
  </ul>
  
  <p>I have written this regex which removes whitespaces successfully:</p>
  
  <pre><code> string username = Regex.Replace(_username, @"\s+", "");
  </code></pre>
  
  <p>But I'd like to upgrade/change it so that it can remove the characters above that I mentioned.</p>
  
  <p>Can someone help me out with this?</p>