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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.matchAll()</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var regexp = /t(e)(st(\d?))/g;
    var str = "test1test2";
    var array = [...str.matchAll(regexp)];
    document.getElementById("out").textContent = [
      array[0][0] + " | " + array[0][1] + " | " + array[0][2] + " | " + array[0][3] + " | index=" + array[0].index,
      array[1][0] + " | " + array[1][1] + " | " + array[1][2] + " | " + array[1][3] + " | index=" + array[1].index
    ].join("\n");
  </script>
</body>
</html>

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String.matchAll() — basic (Try It)