CP-31 Change the css regexp for a url to not match whitespace within the (). This fixes a problem where the background-image property had both a url and a gradient set. The flattened image was replacing the entire string rather than just the url. e.g. background-image: url(/images/global/supertab-icons.png?1379946938), -webkit-radial-gradient(50% -160px, circle farthest-side, rgba(255, 255, 255, 0.74902), rgba(255, 255, 255, 0));