code: public static ExtractRegular getInstance(List<UrlPattern> urlPatterns){
          if (extractRegular != null) {
              return extractRegular;
          }
          synchronized (ExtractRegular.class) {
              if (extractRegular == null) {
                  extractRegular = new ExtractRegular();
                  //初始化抽取规则
                  extractRegular.init(urlPatterns);
              }
          }
          return extractRegular;
      }
docs: 获取抽取规则实例
  @param urlPatterns url模式列表
  @return 抽取规则实例