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    Compiling REx `(")[^\1]*\1'
size 19 first at 3
   1: OPEN1(3)
...
   8:   ANYOF[\0\2-\377](0)
  17: REF1(19)
  19: END(0)
  2. or download this
    Compiling REx `(")((?!\1).)*\1'
size 24 first at 3
   1: OPEN1(3)
...
  21:   NOTHING(22)
  22: REF1(24)
  24: END(0)