diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/string-regexp-capture-groups.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/string-regexp-capture-groups.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+"abcdefg".match(/(x)y(z)/g);
+assertEq(RegExp.$1, "");
+
+assertEq("abcdef".match(/a(b)cd/g)[0], "abcd");
+assertEq(RegExp.$1, "b");
+assertEq(RegExp.$2, "");
+
+"abcdef".match(/(a)b(c)/g);
+assertEq(RegExp.$1, "a");
+assertEq(RegExp.$2, "c");
+assertEq(RegExp.$3, "");
+
+"abcabdabe".match(/(a)b(.)/g);
+assertEq(RegExp.$1, "a");
+assertEq(RegExp.$2, "e");
+
+"abcdefg".match(/(x)y(z)/g);
+assertEq(RegExp.$1, "a");    //If there's no match, we don't update the statics.
+
+"abcdefg".match(/(g)/g);
+assertEq(RegExp.$1, "g");