case BACKTRACE:
                 /*将当前状态与子状态机的结束状态连接*/
                 setdestState(g_st->curState, (int)g_st->eleCount, g_mstk->topM->state_end);
                 /*将当前状态回退到子状态机的头部,开始一个新的分支*/
                 g_st->curState = g_mstk->topM->state_start;
                 break;
             case INPUT_ELE:
                 /*是一个终结符,连上一条弧*/
                 g_lastchar = g_symbol_charvalue;
                 psnew = newState();
                 appendStateTable(g_st, psnew);   /*添加到状态表*/
                 setdestState(g_st->curState, (int)g_symbol_charvalue, psnew);

                 /*重复运算符*/
                 getSymbol();
                 switch (g_symbol_type) {
                     case REPEAT_ZERO_MORE:
                         /*(a*)*/
                         setdestState(g_st->curState, g_st->eleCount, psnew);
                         setdestState(psnew, g_st->eleCount, g_st->curState);
                         /*移动到新的状态*/
                         g_st->curState = psnew;
                         printf("debug: ZEOR_MORE\n");
                         break;
                     case REPEAT_ZERO_ONCE:
                         /*(a?)*/
                         setdestState(g_st->curState, g_st->eleCount, psnew);
                         /*移动到新的状态*/
      &nb