--- a/nashorn/src/jdk/nashorn/internal/objects/NativeRegExp.java	Mon Jun 02 17:36:43 2014 +0200
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeRegExp.java	Tue Jun 03 13:57:52 2014 +0530
@@ -737,6 +737,12 @@
             if (nextChar == '$') {
                 // Skip past $
                 cursor++;
+                if (cursor == replacement.length()) {
+                    // nothing after "$"
+                    sb.append('$');
+                    break;
+                }
+
                 nextChar = replacement.charAt(cursor);
                 final int firstDigit = nextChar - '0';
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8044612.js	Tue Jun 03 13:57:52 2014 +0530
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2014, 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-8044612: StringIndexOutOfBoundException in NativeRegExp.appendReplacement
+ *
+ * @test
+ * @run
+ */
+
+if ("hello".replace("h", "$") != "$ello") {
+    fail("String.prototype.replace failed to handle '$' as replacement");
+}
+
+if ("hello".replace("o", "$x") != "hell$x") {
+    fail("String.prototype.replace failed to handle '$x' as replacement");
+}