JavaScript - Get the URL without the filename.

When I need to get  URL without  the file's name , for example:

instead of

http://contoso.com/pages/test.aspx

I need

http://contoso.com/pages/

I use this script (with regex pattern  "/^(http.+\/)[^\/]+$/"):

location.href.match( /^(http.+\/)[^\/]+$/ )[1]