Web/JavaScript/Reference/Global objects/RegExp/@@matchAll

The [@@matchAll] method returns all matches of the regular expression against a string.

Syntax

regexp[Symbol.matchAll](str)

Parameters

str: A String that is a target of the match.

Return value

An iterator.

Description

This method is called internally in String.prototype.matchAll(). For example, the following two examples return same result.

'abc'.matchAll(/a/);

/a/[Symbol.matchAll]('abc');

This method exists for customizing the behavior of matchAll() in RegExp subclasses.

Examples

Direct call

This method can be used in almost the same way as String.prototype.matchAll(), except for the different value of this and the different order of arguments.

let re = /[0-9]+/g;
let str = '2016-01-02';
let result = re[Symbol.matchAll](str);

console.log(Array.from(result, x => x[0]));  
// ["2016", "01", "02"]

Using @@matchAll in subclasses

Subclasses of RegExp can override the [@@matchAll]() method to modify the default behavior.

For example, to return an Array instead of an iterator:

class MyRegExp extends RegExp {
  [Symbol.matchAll](str) {
    const result = RegExp.prototype[Symbol.matchAll].call(this, str);
    if (!result) { 
      return null;
    } else {
      return Array.from(result);
    }
  }
}

const re = new MyRegExp('([0-9]+)-([0-9]+)-([0-9]+)', 'g');
const str = '2016-01-02|2019-03-07';
const result = str.matchAll(re);
console.log(result[0]); // [ "2016-01-02", "2016", "01", "02" ]
console.log(result[1]); // [ "2019-03-07", "2019", "03", "07" ]

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'RegExp.prototype[@@matchAll' in that specification.]

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`@@matchAll`	Chrome Full support 73	Edge Full support 79	Firefox Full support 67	IE No support No	Opera Full support 60	Safari Full support 13	WebView Android Full support 73	Chrome Android Full support 73	Firefox Android Full support 67	Opera Android Full support 52	Safari iOS Full support 13	Samsung Internet Android Full support 5.0	nodejs Full support 12.0.0

Legend

Full support: Full support
No support: No support