/* One " two */ a = b + 4; /* three " four */

##</code><code>##

s { (     [^"'/]*                          # Not a string, character or comment.
      |  "[^\\"]*(?:\\.[^\\"]*)*"          # String.
      |  '[^\\']*(?:\\.[^\\']*)*'          # Char.
      |  / (?![*])                         # Slash, not a comment.
    )
      |
    ( /[*] [^*]* (?: [*] [^*/]* )* [*]/ )  # Comment.
  }
  { $2 ? "" : $1 }gsex;