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// Tests from http://blog.stevenlevithan.com/archives/npcg-javascript

assertEquals(true, /(x)?\1y/.test("y"));
assertEquals(["y", undefined], /(x)?\1y/.exec("y"));
assertEquals(["y", undefined], /(x)?y/.exec("y"));
assertEquals(["y", undefined], "y".match(/(x)?\1y/));
assertEquals(["y", undefined], "y".match(/(x)?y/));
assertEquals(["y"], "y".match(/(x)?\1y/g));
assertEquals(["", undefined, ""], "y".split(/(x)?\1y/));
assertEquals(["", undefined, ""], "y".split(/(x)?y/));
assertEquals(0, "y".search(/(x)?\1y/));
assertEquals("z", "y".replace(/(x)?\1y/, "z"));
assertEquals("", "y".replace(/(x)?y/, "$1"));
assertEquals("undefined", "y".replace(/(x)?\1y/,
    function($0, $1){ 
        return String($1); 
    }));
assertEquals("undefined", "y".replace(/(x)?y/, 
    function($0, $1){ 
        return String($1); 
    }));
assertEquals("undefined", "y".replace(/(x)?y/, 
    function($0, $1){ 
        return $1; 
    }));

// See https://bugzilla.mozilla.org/show_bug.cgi?id=476146
assertEquals("bbc,b", /^(b+|a){1,2}?bc/.exec("bbc"));
assertEquals("bbaa,a,,a", /((\3|b)\2(a)){2,}/.exec("bbaababbabaaaaabbaaaabba"));

