Entering Range of Characters

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Write a javascript code to match a character in a range of characters.

 
<html>
  <head>
    <script>

      var p = /[a-z]/; 
        
       function testMatch() 
       {
           var str = document.getElementById("textfield").value; 

           if (p.test(str)) 
           {
               alert("The string \"" + str + "\" contains characters in range a-z.");
           } 
           else 
           {
               alert("The string \"" + str + "\" does not contain characters in range a-z.");
           }
       }

   </script>
  </head>
<body>

             <h3> Checking the availability of characters 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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