Deleting multiple backslashes; regex?

Anyone have a regex pattern for deleting multiple backslashes e.g., \\\\\\\ I pretty good with regex; but, be damned if I can delete them with preg_replace() I've tried "\\\\" as the manual says preg_replace("/\\\\/", '', $str); preg_replace("/(\\\\)+/", '', $str); preg_replace("/\x5C/", '', $str); preg_replace("/\\x5c/", '', $str); And lots of others. stripslashes() and stripcslashes() are limited.