The 's' replaces a single Area match at any given time even so the 's+' replaces the whole Room sequence at the same time with the 2nd parameter. In cases like this, it can make no big difference, since you are replacing every thing with the empty string (Even though https://edwinoidxt.blogspothub.com/30685969/mantra-mushroom-chocolate-bars-can-be-fun-for-anyone