Write a JavaScript function to check whether a given value is a valid URL or not

Write a JavaScript function to check whether a given value is a valid URL or not

3 years ago

Write a JavaScript function to check whether a given value is a valid URL or not. There is a simple way to validate if an URL is valid in Javascript, no messy Regex needed.

<!DOCTYPE html>
<html>
<head>
  <title>URL Validation</title>
</head>
<body>

<script type="text/javascript">
	function is_url(str)
	{
	  regexp =  /^(?:(?:https?|ftp):\/\/)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:\/\S*)?$/;
	        if (regexp.test(str))
	        {
	          return 'It is a valid URL.';
	        }
	        else
	        {
	          return 'Not valid URL';
	        }
	}

	alert(is_url("http://www.rajlama.com.np"));
</script>
</body>
</html>