test/mjsunit/regexp-indexof.js

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function CheckMatch(re, str, matches) {
  assertEquals(matches.length > 0, re.test(str));
  var result = str.match(re);
  if (matches.length > 0) {
    assertEquals(matches.length, result.length);
    var lastExpected;
    var lastFrom;
    var lastLength;
    for (var idx = 0; idx < matches.length; idx++) {
      var from = matches[idx][0];
      var length = matches[idx][1];
      var expected = str.substr(from, length);
      var name = str + "[" + from + ".." + (from+length) + "]";
      assertEquals(expected, result[idx], name);
      if (re.global || idx == 0) {
        lastExpected = expected;
        lastFrom = from;
        lastLength = length;
      }
    }
    assertEquals(lastExpected, RegExp.lastMatch, "lastMatch");
    assertEquals(str.substr(0, lastFrom), RegExp.leftContext, "leftContext");
    assertEquals(
        str.substr(lastFrom + lastLength), RegExp.rightContext, "rightContext");
  } else {
    assertTrue(result === null);
  }
}

CheckMatch(/abc/, "xxxabcxxxabcxxx", [[3, 3]]);
CheckMatch(/abc/g, "xxxabcxxxabcxxx", [[3, 3], [9, 3]]);
CheckMatch(/abc/, "xxxabababcxxxabcxxx", [[7, 3]]);
CheckMatch(/abc/g, "abcabcabc", [[0, 3], [3, 3], [6, 3]]);
CheckMatch(/aba/g, "ababababa", [[0, 3], [4, 3]]);
CheckMatch(/foo/g, "ofooofoooofofooofo", [[1, 3], [5, 3], [12, 3]]);
CheckMatch(/foobarbaz/, "xx", []);
CheckMatch(new RegExp(""), "xxx", [[0, 0]]);
CheckMatch(/abc/, "abababa", []);

assertEquals("xxxdefxxxdefxxx", "xxxabcxxxabcxxx".replace(/abc/g, "def"));
assertEquals("o-o-oofo-ofo", "ofooofoooofofooofo".replace(/foo/g, "-"));
assertEquals("deded", "deded".replace(/x/g, "-"));
assertEquals("-a-b-c-d-e-f-", "abcdef".replace(new RegExp("", "g"), "-"));

CheckMatch(/a(.)/, "xyzzyabxyzzzyacxyzzy", [[5, 2], [6, 1]]);
CheckMatch(/a(.)/g, "xyzzyabxyzzyacxyzzy", [[5, 2], [12, 2]]);

CheckMatch(/a|(?:)/g, "aba", [[0, 1], [1, 0], [2, 1], [3, 0]]);
CheckMatch(/a|(?:)/g, "baba", [[0, 0], [1, 1], [2, 0], [3, 1], [4, 0]]);
CheckMatch(/a|(?:)/g, "bab", [[0, 0], [1, 1], [2, 0], [3, 0]]);