Remove multiple trailing slashes in a single 301 in .htaccess?

Question

There is a similar question here, but the solution does not work in Apache for our site.

I'm trying to remove multiple trailing slashes from URLs on our site. I found some .htaccess code that seems to work:

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} ^(.*)//(.*)$
RewriteRule . %1/%2 [R=301,L]

This rule removes multiple slashes from anywhere in the URL:

http://www.mysite.com/category/accessories////
becomes
http://www.mysite.com/category/accessories/

However, it redirects once for every extra slash. So:

http://www.mysite.com/category/accessories///////
301 Redirects to
http://www.mysite.com/category/accessories//////
301 Redirects to
http://www.mysite.com/category/accessories/////
301 Redirects to
http://www.mysite.com/category/accessories////
301 Redirects to
http://www.mysite.com/category/accessories///
301 Redirects to
http://www.mysite.com/category/accessories//
301 Redirects to
http://www.mysite.com/category/accessories/

Is it possible to rewrite this rule so that it does it all in a single 301 redirect?

Also, this above directive does not work at the root level of our site:

http://www.mysite.com///// does not redirect but it should.

Answer 1

If the slashes may only occur at the end of the URL, you may use this

RewriteCond %{REQUEST_URI} ^(.*?)(?:/){2,}$
RewriteRule . $1/ [R=301,L]

Answer 2

RewriteEngine on
RewriteBase /
RewriteCond %{HTTP_HOST} !=""
RewriteCond %{THE_REQUEST} ^[A-Z]+\s//+(.*)\sHTTP/[0-9.]+$ [OR]
RewriteCond %{THE_REQUEST} ^[A-Z]+\s(.*/)/+\sHTTP/[0-9.]+$
RewriteRule .* http://%{HTTP_HOST}/%1 [R=301,L]