Function assertMatchAll

deps/v8/test/mjsunit/regexp-duplicate-named-groups.js:133–139

(matches, expected)

    'xzzyyxxy'.split(/(?:(?:(?<a>x)|(?<a>y)|(a)|(?<b>b)|(?<a>z))\k<a>)/));

function assertMatchAll(matches, expected) {
  let i = 0;
  for (match of matches) {
    assertEquals(expected[i], match);
    i++;
  }
}
assertMatchAll(
    'xyx'.matchAll(/(?<a>x)|(?<a>y)/g),
    [['x', 'x', undefined], ['y', undefined, 'y'], ['x', 'x', undefined]]);