<A target="_blank" href="http://www.wohill.com/design/283/JavaScript-validation-for-a-website-address.html">Back in August 2008</A> Niklas Waller posted some <A target="_blank" href="http://www.wohill.com/design/456/Javascript-regular-expression-for-url-check.html">code to validate if a URL</A> is properly formatted before submitting it to a form. But, after thinking on it, it seemed to be missing something so he's added to it.