String.prototype.matchAll()

const regexp = /t(e)(st(\d?))/g;
const str = "test1test2";

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

console.log(array[0]);
// Expected output: Array ["test1", "e", "st1", "1"]

console.log(array[1]);
// Expected output: Array ["test2", "e", "st2", "2"]

const regexp = RegExp("foo*", "g");
const str = "table football, foosball";

while ((matches = regexp.exec(str)) !== null) {
  console.log(`Found ${matches[0]}. Next starts at ${regexp.lastIndex}.`);
  // expected output: "Found foo. Next starts at 9."
  // expected output: "Found foo. Next starts at 19."
}

const regexp = RegExp("foo*", "g");
const str = "table football, foosball";
let matches = str.matchAll(regexp);

for (const match of matches) {
  console.log(match);
}
// Array [ "foo" ]
// Array [ "foo" ]

//      for of
//      matchAll 
matches = str.matchAll(regexp);

Array.from(matches, (m) => m[0]);
// Array [ "foo", "foo" ]

var regexp = /t(e)(st(\d?))/g;
var str = "test1test2";

str.match(regexp);
// Array ['test1', 'test2']

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

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