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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Decimal Validator</title>
	<script>

		function validateDecimal(valor) {

		    var regex = /^\d+(?:\.\d{0,2})$/;
		    if (regex.test(valor)) {
		        return true;
		    } else {
		        return false;
		    }
		}

		console.log("2 -> "+validateDecimal(2));
		console.log("2.54 -> "+validateDecimal(2.54));
		console.log("2.5454 -> "+validateDecimal(2.5454));
	</script>
</head>
<body>

</body>
</html>