preg_match help matching any amount of trailing slashes

I am having trouble matching trailing slashes.

What I need to do is match any amount of trailing slashes then cut them off if they exist....

so in the code below there could also be ///// slashes at the end

I am pretty sure my regex is not correct so any help would be great.

<?
$lastref = 'http://domain.net/';

$slashes = '/\/$/';
while (preg_match($slashes,$lastref)){
$lastref = rtrim("$lastref", '/');
}
echo $lastref;
?>

Code (markup):

Thanks in advance


Edit woops.........I just figured it out!