Matching Digits and Non-digits

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Write a javascript code to match digits.

<html>
  <head>
    <script>

         var p = /\d/; 

         function testMatch() 
         {
             var str = document.getElementById("textfield").value;
             if (p.test(str)) 
             {
                 alert("The string \"" + str + "\" contains digits.");
             } 
             else 
             {
                 alert("The string \"" + str + "\" does not contain digits.");
             }
         }

    </script>
  </head>
<body>

          <h3>Checking the availability of character in given range.</h3>

          Enter the String: <input type="text" id="textfield" />

          <input type="button" value="Check" onclick="testMatch();" />

  </body>
</html>

Output:

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