How? Do you start all your URLs with "www"? I know I don't, so a regex couldn't possibly know until I typed either a space or a dot.
On the other hand, if you could make this work, I'd love to see it.
On the other hand, if you could make this work, I'd love to see it.
Alternatively, although not intuitive, if the user enters focus with the search bar through a specific key-stroke: CTRL + L for a regular URL entry, and re-route CTRL + K to our web-bar, but with suggestions.