diff -r ae7797bbdf86 -r c543a06f002f nashorn/test/script/basic/JDK-8137240.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8137240.js	Fri Jun 24 12:39:42 2016 +0200
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8137240: Negative lookahead in RegEx breaks backreference
+ *
+ * @test
+ * @run
+ */
+
+
+Assert.assertEquals('aa'.replace(/(a)(?!b)\1/gm, 'c'), 'c');
+
+var result = 'aa'.match(/(a)(?!b)\1/);
+Assert.assertTrue(result.length === 2);
+Assert.assertTrue(result[0] === 'aa');
+Assert.assertTrue(result[1] === 'a');
+
+result = 'aa'.match(/(a)(?!(b))\2(a)/);
+Assert.assertTrue(result.length === 4);
+Assert.assertTrue(result[0] === 'aa');
+Assert.assertTrue(result[1] === 'a');
+Assert.assertTrue(result[2] === undefined);
+Assert.assertTrue(result[3] === 'a');