Google completely ignores single quotes, but strings enclosed in double quotes are searched for about as I'd expect.... minus the punctuation.
For instance, search for a phrase like
'imag' leader
You get "Showing results for 'image' leader. Search instead for 'imag' leader."
Change them to double quotes, and it actually finds "imag". Google suggests "Did you mean: "image" leader", but does not automatically change the search as in the other instance.
However, search for something like "image.url", and it is the same as searching for "image url" (not imageurl). Google appears to replace the '.' with a space.
