code: public FieldMatcher setActived(String actived) {
          if (actived != null)
              this.actived = Regex.getPattern(actived);
          else
              this.actived = null;
          return this;
      }
docs: 设置过滤可用字段/属性的正则表达式
  @param actived 正则表达式
  @return 原对象,用于链式调用