To validate decimal numbers in JavaScript, use the match() method. It retrieves the matches when matching a string against a regular expression.
Example
You can try to run the following code to validate decimal numbers −
<html>
<body>
<script>
var str = "1.5";
var re = /^[-+]?[0-9]+\.[0-9]+$/;
var found = str.match( re );
document.write("decimal" );
</script>
</body>
</html>