The matchAll() method returns an iterator of all results matching a string against a regular expression, including capturing groups.





A regular expression object.

If a non-RegExp object obj is passed, it is implicitly converted to a RegExp by using new RegExp(obj).

The RegExp object must have the /g flag, otherwise a TypeError will be thrown.

Return value

An iterator (which is not a restartable iterable).


Regexp.exec() and matchAll()

Prior to the addition of matchAll to JavaScript, it was possible to use calls to regexp.exec (and regexes with the /g flag) in a loop to obtain all the matches:

const regexp = RegExp('foo[a-z]*','g');
const str = 'table football, foosball';
let match;

while ((match = regexp.exec(str)) !== null) {
  console.log(`Found ${match[0]} start=${match.index} end=${regexp.lastIndex}.`);
  // expected output: "Found football start=6 end=14."
  // expected output: "Found foosball start=16 end=24."

With matchAll available, you can avoid the while loop and exec with g.

Instead, by using matchAll, you get an iterator to use with the more convenient for...of, array spread, or Array.from() constructs:

const regexp = RegExp('foo[a-z]*','g');
const str = 'table football, foosball';
const matches = str.matchAll(regexp);

for (const match of matches) {
  console.log(`Found ${match[0]} start=${match.index} end=${match.index + match[0].length}.`);
// expected output: "Found football start=6 end=14."
// expected output: "Found foosball start=16 end=24."

// matches iterator is exhausted after the for..of iteration
// Call matchAll again to create a new iterator
Array.from(str.matchAll(regexp), m => m[0]);
// Array [ "football", "foosball" ]

matchAll will throw an exception if the g flag is missing.

const regexp = RegExp('[a-c]','');
const str = 'abc';
// TypeError

matchAll internally makes a clone of the regexp—so, unlike regexp.exec(), lastIndex does not change as the string is scanned.

const regexp = RegExp('[a-c]','g');
regexp.lastIndex = 1;
const str = 'abc';
Array.from(str.matchAll(regexp), m => `${regexp.lastIndex} ${m[0]}`);
// Array [ "1 b", "1 c" ]

Better access to capturing groups (than String.prototype.match())

Another compelling reason for matchAll is the improved access to capture groups.

Capture groups are ignored when using match() with the global /g flag:

let regexp = /t(e)(st(\d?))/g;
let str = 'test1test2';

// Array ['test1', 'test2']

Using matchAll, you can access capture groups easily:

let array = [...str.matchAll(regexp)];

// ['test1', 'e', 'st1', '1', index: 0, input: 'test1test2', length: 4]
// ['test2', 'e', 'st2', '2', index: 5, input: 'test1test2', length: 4]


ECMAScript (ECMA-262)
The definition of 'String.prototype.matchAll' in that specification.

Browser compatibility

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ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
matchAllChrome Full support 73Edge Full support 79Firefox Full support 67IE No support NoOpera Full support 60Safari Full support 13WebView Android Full support 73Chrome Android Full support 73Firefox Android Full support 67Opera Android Full support 52Safari iOS Full support 13Samsung Internet Android No support Nonodejs Full support 12.0.0


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See also