Pastable version of Filterting a List<> with a Regular Expression

<pre class='prettyprint' language='cs'>List&lt;Document&gt; documents = documentLayer.GetDocuments(username);
  List&lt;Document&gt; filteredDocuments = new List&lt;Document&gt;();

string documentName = (string)Session[&quot;DocumentName&quot;];
  string documentAuthor = (string)Session[&quot;DocumentAuthor&quot;];
            
  if ((string.IsNullOrEmpty(documentName)) &amp;&amp; (string.IsNullOrEmpty(documentAuthor)))
  {
    documents.DataSource = documents;
    documents.DataBind();
  }
  else
  {
    foreach (Document document in documents)
    {
      string name = document.Name;
      string author = document.Author;

if (!(string.IsNullOrEmpty(documentName)) &amp;&amp; !(string.IsNullOrEmpty(documentAuthor)))
      {
        if ((Regex.IsMatch(name, documentName)) &amp;&amp; (Regex.IsMatch(author, documentAuthor)))
        {
          filteredDocuments.Add(document);
        }
      }
      else if (string.IsNullOrEmpty(documentName))
      {
        if (Regex.IsMatch(author, documentAuthor))
        {
          filteredDocuments.Add(document);
        }
      }
      else if (string.IsNullOrEmpty(documentAuthor))
      {
        if (Regex.IsMatch(name, documentName))
        {
          filteredDocuments.Add(document);
        }
      }
    }
  
    documents.DataSource = filteredDocuments;
    documents.DataBind();
  }</pre>
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Pastable version of Filterting a List<> with a Regular Expression