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Using regular expression (callback function)

   

<html>
  <head>
    <title></title>
    <script type="text/javascript">
        function transformToLowercase(theString)
        {
          return theString.toLowerCase();
        }
        
        var string = "this is a TEST.";
        var pattern = /TEST/;
        var result = string.replace(pattern, transformToLowercase);
        
        document.write( result);
  
    </script>
  </head>
  <body>
  </body>
</html>

   
    
    
  








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