RegExp.prototype[@@matchAll]()

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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 match behavior within RegExp subclasses.

Examples

Direct call

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

var re = /[0-9]+/g;
var str = '2016-01-02';
var 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) {
    var result = RegExp.prototype[Symbol.matchAll].call(this, str);
    if (!result) { 
      return null;
    } else {
      return Array.from(result);
    }
  }
}

var re = new MyRegExp('([0-9]+)-([0-9]+)-([0-9]+)', 'g');
var str = '2016-01-02|2019-03-07';
var 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 Status Comment
ECMAScript Latest Draft (ECMA-262)
The definition of 'RegExp.prototype[@@matchAll]' in that specification.
Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
@@matchAllChrome Full support 73Edge No support NoFirefox Full support 67IE No support NoOpera Full support 60Safari No support NoWebView Android Full support 73Chrome Android Full support 73Firefox Android Full support 67Opera Android Full support YesSafari iOS No support NoSamsung Internet Android Full support Yesnodejs Full support 12.0.0

Legend

Full support  
Full support
No support  
No support

See also