diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/String/replace-updates-global-lastIndex.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/String/replace-updates-global-lastIndex.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+var BUGNUMBER = 501739;
+var summary =
+  "String.prototype.relace should zero the .lastIndex when called with a " +
+  "global RegExp";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var s = '0x2x4x6x8';
+
+var p1 = /x/g;
+p1.lastIndex = 3;
+s.replace(p1, '');
+assertEq(p1.lastIndex, 0);
+
+var p2 = /x/g;
+p2.lastIndex = 3;
+var c = 0;
+s.replace(p2, function(s) {
+    assertEq(p2.lastIndex++, c++);
+    return 'y';
+});
+assertEq(p2.lastIndex, 4);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");