Port regexp tests from V8 to Dart.

tests/corelib/regexp/captures_test.dart

Index: tests/corelib/regexp/captures_test.dart
diff --git a/tests/corelib/regexp/captures_test.dart b/tests/corelib/regexp/captures_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..292eb5488d2f2b726a26486cddee03060cc7e824
--- /dev/null
+++ b/tests/corelib/regexp/captures_test.dart
@@ -0,0 +1,12 @@
+// 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.
+
+import 'util.dart';
+import 'package:expect/expect.dart';
+
+void main() {
+  var re = new RegExp(r"^(((N({)?)|(R)|(U)|(V)|(B)|(H)|(n((n)|(r)|(v)|(h))?)|(r(r)?)|(v)|(b((n)|(b))?)|(h))|((Y)|(A)|(E)|(o(u)?)|(p(u)?)|(q(u)?)|(s)|(t)|(u)|(w)|(x(u)?)|(y)|(z)|(a((T)|(A)|(L))?)|(c)|(e)|(f(u)?)|(g(u)?)|(i)|(j)|(l)|(m(u)?)))+");
+  var str = "Avtnennan gunzvmu pubExnY nEvln vaTxh rmuhguhaTxnY";
+  assertTrue(re.hasMatch(str));
+}