diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/RegExp/regress-576828.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/RegExp/regress-576828.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+var re = /(z\1){3}/;
+var str = 'zzz';
+var actual = re.exec(str);
+var expected = makeExpectedMatch(['zzz', 'z'], 0, str);
+checkRegExpMatch(actual, expected);
+
+if (typeof reportCompare == 'function')
+    reportCompare(true, true);