1 files changed, 9 insertions, 0 deletions
diff --git a/js/src/tests/non262/RegExp/regress-613820-3.js b/js/src/tests/non262/RegExp/regress-613820-3.js
new file mode 100644
index 0000000000..126e838ff2
--- /dev/null
+++ b/js/src/tests/non262/RegExp/regress-613820-3.js
@@ -0,0 +1,9 @@
+/* Capture group reset to undefined during second iteration, so backreference doesn't see prior result. */
+var re = /(?:^(a)|\1(a)|(ab)){2}/;
+var str = 'aab';
+var actual = re.exec(str);
+var expected = makeExpectedMatch(['aa', undefined, 'a', undefined], 0, str);
+checkRegExpMatch(actual, expected);
+
+if (typeof reportCompare === 'function')
+    reportCompare(true, true);