The quotes and the slash are necessary in the query. I'll demonstrate with "highrankings.com".
If you search on the URL for this domain, Google offers you several options, including "Find Web pages that contain the term 'www.highrankings.com/'". If you click on that link, you will find that the query string looks like this:
This is a method I've been recommending people use for over a year. Google has recently begun advising people to use it, too (I doubt they have been much influenced by me, but it does tell you a lot about how your Web site is being mentioned on the Web).
The results can be modified. For example, if we want to exclude all of highrankings.com's internal references, we can use the site: command to exclude it. The query string looks like this:
You usually get more than links with this report, but you at least have a fairly accurate upper bound report on actual links that Google has in its index. No guessing on the basis of what other search engines know.
Now compare those searches to a link search for highrankings.com and you'll see that you're getting far fewer results than before. The results from the link search are not anywhere near the actual number of links Google knows about.