Compiling REx `(")[^\1]*\1'
size 19 first at 3
   1: OPEN1(3)
   3:   EXACT <">(5)
   5: CLOSE1(7)
   7: STAR(17)
   8:   ANYOF[\0\2-\377](0)
  17: REF1(19)
  19: END(0)

##</code><code>##

Compiling REx `(")((?!\1).)*\1'
size 24 first at 3
   1: OPEN1(3)
   3:   EXACT <">(5)
   5: CLOSE1(7)
   7: CURLYM[2] {0,32767}(22)
  11:   UNLESSM[-0](17)
  13:     REF1(15)
  15:     SUCCEED(0)
  16:     TAIL(17)
  17:   REG_ANY(20)
  20:   SUCCEED(0)
  21:   NOTHING(22)
  22: REF1(24)
  24: END(0)