URL validation in sharepoint through javascript

In SharePoint 2013 there are cases when you would like to validated client side URL and prompt user if it is invalid URL. Below code snippet can be used for this validation. Edit newform.aspx and editform.aspx, place a script editor webpart with following code snippet. You can alternatively created feature and on feature activation event add script edit, inject this js code.

	<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
	<script>
	function isValid(val) {
	var re = /^(https?:\/\/)([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/;
	return re.test(val);
	}
	function PreSaveAction(){
	var commentsBox = findFieldControl('URL Required Field'); //find field control by title
	if (!isValid(commentsBox.val())) {
	var errorHtml = '<span class="ms-formvalidation" title="errMessage"><br/><span role="alert">Invalid URL, please rectify URL and try again.<br></span></span>';
	commentsBox.after(errorHtml);
	return false;
	}
	return true;
	}
	function findFieldControl(fieldTitle)
	{
	var control = $('[title="' + fieldTitle + '"]');
	var errMessage= $('span[title="errMessage"]');
	if(errMessage.length>0)
	{
	errMessage.remove();
	}
	return control;
	}
	</script>​​​​​​

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