sovan/replace1.html at master · Sum-Sovann2018/sovan · GitHub

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<!DOCTYPE html>
<html>
<head>
	<title></title>
	<script type="text/javascript">

		//1  var str="hello 123";
		//2 var str="hello 1 3";
		//3 var str="batch";
		//4var str="abatchq12";
		var str="batchqwerds";
		//var str="welcome to batch6";
		function a()
		{
			//1 vtn=str.replace(/\d\ d\d/gi,"$$$$$");// (\s we use for spaceing to chang replace) ( \t for 8 space )(\d mean decimal to find digite of number)(\w find word charecter)

           //2 vtn=str.replace(/\d\s\d/g,"$$$")

          //3 vtn=str.replace(/batch[0-9]?/gi,"$"); //( ?:make the previuos chareter optional)


          //4  vtn=str.replace(/.batch./gi,"$");//(... mean to alert all string in str one . one aksor)


          //5  vtn=str.replace(/.+/gi,"$");//(.+ print only $)

          // vtn=str.replace(/.*/gi,"$");//(.* print $ 2time)


           //vtn=str.replace(/ba[a-z]/gi,"$");//(it mean to chang that aksor)

           vtn=str.replace(/[a-z]{2} $/gi,"*****");


			  alert(vtn);
		}
	</script>
</head>
<body>
	<button onclick="a()"> click </button>

</body>
</html>