8025197: String replace method fails with regexp /$/gi

Reviewed-by: sundar

nashorn/src/jdk/nashorn/internal/objects/NativeRegExp.java

@@ -697,8 +697,13 @@ public final class NativeRegExp extends ScriptObject {
                 appendReplacement(matcher, string, replacement, sb);
             }
 
-            // ECMA 15.5.4.10 String.prototype.match(regexp)
             thisIndex = matcher.end();
+            if (thisIndex == string.length() && matcher.start() == matcher.end()) {
+                // Avoid getting empty match at end of string twice
+                break;
+            }
+
+            // ECMA 15.5.4.10 String.prototype.match(regexp)
             if (thisIndex == previousLastIndex) {
                 setLastIndex(thisIndex + 1);
                 previousLastIndex = thisIndex + 1;

nashorn/test/script/basic/JDK-8025197.js

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2010, 2013, 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-8025197: String replace method fails with regexp /$/gi
+ *
+ * @test
+ * @run
+ */
+
+print('dog'.replace(/$/gi, 's'));
+print('dog'.replace(/(?:g)$/gi, 's'));
+print('dog'.replace(/(?:a)$/gi, 's'));
+print('dog'.replace(/(?!g)$/gi, 's'));
+print('dog'.replace(/(?!a)$/gi, 's'));
+print('dog'.replace(/g?$/gi, 's'));
+print('dog'.replace(/.?$/gi, 's'));

nashorn/test/script/basic/JDK-8025197.js.EXPECTED

@@ -0,0 +1,7 @@
+dogs
+dos
+dog
+dogs
+dogs
+doss
+doss