The [@@split]() method splits a String object into an array of strings by separating the string into substrings.


regexp[Symbol.split](str[, limit])


The target of the split operation.

Optional. Integer specifying a limit on the number of splits to be found. The [@@split]() method still splits on every match of this RegExp pattern, until the number of split items match the limit or the string falls short of this pattern.

Return value

An Array containing substrings as its elements.


This method is called internally in String.prototype.split() if the separator argument is a RegExp object. For example, the following two examples return the same result.



This method exists for customizing the split behavior in RegExp subclass.

If the str argument is not a RegExp object, String.prototype.split() doesn't call this method, nor create a RegExp object.


Direct call

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

var re = /-/g;
var str = '2016-01-02';
var result = re[Symbol.split](str);
console.log(result);  // ["2016", "01", "02"]

Using @@split in subclasses

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

class MyRegExp extends RegExp {
  [Symbol.split](str, limit) {
    var result = RegExp.prototype[Symbol.split].call(this, str, limit);
    return => "(" + x + ")");

var re = new MyRegExp('-');
var str = '2016-01-02';
var result = str.split(re); // String.prototype.split calls re[@@split].
console.log(result); // ["(2016)", "(01)", "(02)"]


Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'RegExp.prototype[@@split]' in that specification.
Standard Initial definition.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'RegExp.prototype[@@split]' in that specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support ? 49 (49) ? ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? 49.0 (49) ? ? ?

See also

Document Tags and Contributors

 Contributors to this page: h4writer, fscholz, arai
 Last updated by: h4writer,