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// UC16
// Characters used:
// "\u03a3\u03c2\u03c3\u039b\u03bb" - Sigma, final sigma, sigma, Lambda, lamda
assertEquals("x\u03a3\u03c3x,\u03a3",
              String(/x(.)\1x/i.exec("x\u03a3\u03c3x")), "backref-UC16");
assertFalse(/x(...)\1/i.test("x\u03a3\u03c2\u03c3\u03c2\u03c3"),
            "\\1 ASCII, string short");
assertTrue(/\u03a3((?:))\1\1x/i.test("\u03c2x"), "backref-UC16-empty");
assertTrue(/x(?:...|(...))\1x/i.test("x\u03a3\u03c2\u03c3x"),
           "backref-UC16-uncaptured");
assertTrue(/x(?:...|(...))\1x/i.test("x\u03c2\u03c3\u039b\u03a3\u03c2\u03bbx"),
           "backref-UC16-backtrack");
var longUC16String = "x\u03a3\u03c2\u039b\u03c2\u03c3\u03bb\u03c3\u03a3\u03bb";
assertEquals(longUC16String + "," + longUC16String.substring(1,4),
             String(/x(...)\1\1/i.exec(longUC16String)),
             "backref-UC16-twice");