It states zero or maybe more incidence of whitespace characters, accompanied by a comma and then accompanied by zero or maybe more event of whitespace people. On the other hand x.replaceAll("\s+", ""); might be far more effective way of trimming spaces (if string might have a number of contiguous spaces) https://mantraherobar19753.fitnell.com/72191648/the-basic-principles-of-mantra-mushroom-chocolate-bars