A polyfill for the String.prototype.matchAll method. Only available in Node12+ and most browsers.

readme.md

I know almost all browsers and Node installations support it, but Node 11 doesn't, and I kinda need that right now. So enjoy!

// Useable just like the normal matchAll:

let data = "Hello World!";
let rx = /[A-Z]/g;
let matches = [...data.matchAll(rx)];

console.table(matches);
/* Expected output:
┌─────────┬─────┬───────┬────────────────┬───────────┐
│ (index) │  0  │ index │     input      │  groups   │
├─────────┼─────┼───────┼────────────────┼───────────┤
│    0    │ 'H' │   0   │ 'Hello World!' │ undefined │
│    1    │ 'W' │   6   │ 'Hello World!' │ undefined │
└─────────┴─────┴───────┴────────────────┴───────────┘
*/

matchAll polyfill.js

if(!String.prototype.matchAll) {
    String.prototype.matchAll = function (rx) {
        if (typeof rx === "string") rx = new RegExp(rx, "g"); // coerce a string to be a global regex
        rx = new RegExp(rx); // Clone the regex so we don't update the last index on the regex they pass us
        let cap = []; // the single capture
        let all = []; // all the captures (return this)
        while ((cap = rx.exec(this)) !== null) all.push(cap); // execute and add
        return all; // profit!
    };
}