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  1. or download this
      [A-Z0-9 ,"&-']
  2. or download this
      /^[A-Z0-9 ,"&-']{4,16}$/
  3. or download this
      # Please excuse the long line ;)
  /^[A-Z0-9 ,"&-'][A-Z0-9 ,"&-'][A-Z0-9 ,"&-'][A-Z0-9 ,"&-'][A-Z0-9 ,"
+&-']?[A-Z0-9 ,"&-']? ... repeat total 12 times ... [A-Z0-9 ,"&-']?$/
  4. or download this
      # The set for the characters gets changed :
  [A-Za-z0-9 ,"&-']
...
  # or equivalent

  /^[a-z0-9 ,"&-']{4,16}$/i