0到100非负整数正则表达式怎么写?

/^(?:0|[1-9][0-9]?|100)$/
搭配element的表单验证

    let patter = /^(?:0|[1-9][0-9]?|100)$/;
    let isNumber = (rule, value, callback) => {
      if (!patter.test(value)) {
        return callback(new Error("必須飛負整數且範圍0-100"));
      } else {
        callback();
      }
    };

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        discount: [
          { required: true, message: "請填寫折扣", trigger: "blur" },
          { validator: isNumber }
        ],

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