Compiling REx "(\.|[%"']|x)"
Final program:
   1: OPEN1 (3)
   3:   BRANCH (6)
   4:     EXACT <.> (21)
   6:   BRANCH (18)
   7:     ANYOF["'] (21)
  18:   BRANCH (FAIL)
  19:     EXACT <x> (21)
  21: CLOSE1 (23)
  23: END (0)
minlen 1 
Freeing REx: "(\.|[%"']|x)"