It suggests zero or more occurrence of whitespace people, followed by a comma then followed by zero or even more event of whitespace characters. In this case, it helps make no variation, since you are replacing every thing with the empty string (although it would be better to use \s+ https://mantra-mushroom-chocolate08631.blogdigy.com/not-known-factual-statements-about-mantra-mushroom-chocolate-46835363