@andrewaustin @petebacondarwin

This commit broke the URL validation: ffb6b2f

For example this URL (which uses a curly brackets macro syntax and should be a perfectly valid URL):

http://ads.xxxxx.com/xxxxxx/?pid=1234&pos=c&r={TIMESTAMP}

Also check this
http://stackoverflow.com/questions/5984116/regular-expression-for-w3c-compliant-urls