Can someone please help me find the regex if an input string is a valid xml string?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/86292/how-to-check-for-valid-xml-in-string-input-before-calling-loadxml">How to check for valid xml in string input before calling .LoadXml()</a>  </p>
</blockquote>



<p>In a program I am implementing, user can input a string.
I have to identify that if it is a valid xml then I have to treat it differently.  Is there a regex that can find if a given string is a valid xml?</p>
