filepath validation javascript

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VB

hi i am vaidation filepath using javascript
my code is

var pathX = "[?:[\w]\:|\\)(\\[a-z_\-\s0-9\.]+]+\.(?:.xml)$";
           var Filepath = document.getElementById('<%=txtFolderPath.ClientID %>').value;
           var matchArray = Filepath.match(pathX);
           if (matchArray == null) {

               alert("Please Enter Valid FilePath");
               document.getElementById('<%=txtFolderPath.ClientID %>').focus();
               return false;
         }

but is not validating to any path
can any one help regarding this