It suggests zero or more occurrence of whitespace people, followed by a comma then followed by zero or more incidence of whitespace characters. In this case, it tends to make no big difference, since you are replacing every thing with the empty string (although it would be better to use https://mk-mushroom-gummies32086.isblog.net/mantra-mushroom-chocolate-bars-can-be-fun-for-anyone-48609018