docs: def main():
      """
      Testing function for Flex Regular Expressions to FST DFA
      """
      if len(argv) < 2:
          print 'Usage: %s fst_file [optional: save_file]' % argv[0]
          return
      flex_a = Flexparser()
      mma = flex_a.yyparse(argv[1])
      mma.minimize()
      print mma
      if len(argv) == 3:
          mma.save(argv[2])