Remove the character "\n" and empty spaces from string

i trying to remove the “\n” character along with empty spaces from string thru mapper expression, but it’s not working.

1. input value JsonStr := [\n “AC”\n]
   expected output := [“AC”]
2. input value JsonStr := [\n “AC”,\n “BD”,\n “DE” \n]
   expected output := [“AC”,“BD”,“DE”]
   i tried with JsonStr.toString().replaceAll(/\n/,“”). but it’s not working