Possible to search for URLs containing a substring on Google Search?

Is it possible to search for URLs containing a substring, for example I'd like to find all URLs that have the ".gov.sg" string in it.

E.g.:

silverscheme.gov.sg

Also, can I restrict all the URLs to domains or subdomains only, so:

silverscheme.gov.sg

But not

silverscheme.gov.sg/some/path

If this is not possible, are there other web apps or website that allow for this?