JavaScript replace method
<html>
<body>
<script type="text/javascript">
var str="Visit Microsoft!";
document.write(str.replace("Microsoft","Systech Digital Ltd."));
</script>
</body>
</html>
<body>
<script type="text/javascript">
var str="Visit Microsoft!";
document.write(str.replace("Microsoft","Systech Digital Ltd."));
</script>
</body>
</html>
Result
