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Symbol.search - JavaScript | MDN

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Symbol.search 指定了一个搜索方法，这个方法接受用户输入的正则表达式，返回该正则表达式在字符串中匹配到的下标，这个方法由以下的方法来调用 String.prototype.search()。

更多信息请参见 RegExp.prototype[Symbol.search]() 和 String.prototype.search()。

class caseInsensitiveSearch {
  constructor(value) {
    this.value = value.toLowerCase();
  }
  [Symbol.search](string) {
    return string.toLowerCase().indexOf(this.value);
  }
}

console.log('foobar'.search(new caseInsensitiveSearch('BaR')));
// expected output: 3

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