regExp.@@search

regexp[Symbol.search](str)

'abc'.search(/a/

/a/[Symbol.search]('abc'

var re = /-/g;
var str = '2016-01-02';
var result = re[Symbol.search](str
console.log(result  // 4

class MyRegExp extends RegExp {
  constructor(str) {
    super(str)
    this.pattern = str;
  }
  [Symbol.search](str) {
    return str.indexOf(this.pattern
  }
}

var re = new MyRegExp('a+b'
var str = 'ab a+b';
var result = str.search(re // String.prototype.search calls re[@@search].
console.log(result // 3