Port regexp tests from V8 to Dart.

tests/corelib/regexp/non-greedy-parentheses_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.

[Lasse Reichstein Nielsen, 2014/10/23 13:21:57]

I found the original for this. It starts with:

// Copyright 2013 the V8 project authors. All rights reserved.
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.

and a license different from the Dart LICENSE file.

I think you'll have to include the complete original copyright notice, and just
add Dart to the list - for all the files.

+
+import 'util.dart';
+import 'package:expect/expect.dart';
+
+void main() {
+  description(
+'Test for regression against <a href="https://bugs.webkit.org/show_bug.cgi?id=39289">Wrong result in case of non-iterative matching of subpatterns in non-greedy cases in YARR Interpreter</a>'
+  );
+
+  shouldBe(firstMatch("a", new RegExp(r"(a)??")), ["", null]);
+  shouldBe(firstMatch("b", new RegExp(r"(a)??")), ["", null]);
+  shouldBe(firstMatch("ab", new RegExp(r"(a)??b")), ["ab", "a"]);
+  shouldBe(firstMatch("aaab", new RegExp(r"(a+)??b")), ["aaab", "aaa"]);
+  shouldBe(firstMatch("abbc", new RegExp(r"(a)??(b+)??c")), ["abbc", "a", "bb"]);
+  shouldBe(firstMatch("ac", new RegExp(r"(a)??(b)??c")), ["ac", "a", null]);
+  shouldBe(firstMatch("abc", new RegExp(r"(a(b)??)??c")), ["abc", "ab", "b"]);
+  shouldBe(firstMatch("ac", new RegExp(r"(a(b)??)??c")), ["ac", "a", null]);
+}