Implement $ for non-multiline.

test/mjsunit/regexp.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 226 matching lines @@
 assertEquals("t", "123456789t".replace(re, "$10"), "$10");
 assertEquals("15", "123456789t".replace(re, "$15"), "$10");
 assertEquals("1", "123456789t".replace(re, "$01"), "$01");
 assertEquals("$001", "123456789t".replace(re, "$001"), "$001");
 re = new RegExp("foo(.)");
 assertEquals("bar$0", "foox".replace(re, "bar$0"), "$0");
 assertEquals("bar$00", "foox".replace(re, "bar$00"), "$00");
 assertEquals("bar$000", "foox".replace(re, "bar$000"), "$000");
 assertEquals("barx", "foox".replace(re, "bar$01"), "$01 2");
 assertEquals("barx5", "foox".replace(re, "bar$15"), "$15");
+
+assertFalse(/()foo$\1/.test("football"), "football1");
+assertFalse(/foo$(?=ball)/.test("football"), "football2");
+assertFalse(/foo$(?!bar)/.test("football"), "football3");
+assertTrue(/()foo$\1/.test("foo"), "football4");
+assertTrue(/foo$(?=(ball)?)/.test("foo"), "football5");
+assertTrue(/()foo$(?!bar)/.test("foo"), "football6");
+assertFalse(/(x?)foo$\1/.test("football"), "football7");
+assertFalse(/foo$(?=ball)/.test("football"), "football8");
+assertFalse(/foo$(?!bar)/.test("football"), "football9");
+assertTrue(/(x?)foo$\1/.test("foo"), "football10");
+assertTrue(/foo$(?=(ball)?)/.test("foo"), "football11");
+assertTrue(/foo$(?!bar)/.test("foo"), "football12");
+
+// Check that the back reference has two successors.  See
+// BackReferenceNode::PropagateForward.
+assertFalse(/f(o)\b\1/.test('foo'));
+assertTrue(/f(o)\B\1/.test('foo'));
+
+assertFalse(/f(o)$\1/.test('foo'), "backref detects at_end");