Reapply "Port regexp tests from V8 to Dart."

tests/corelib/regexp/constructor_test.dart

Index: tests/corelib/regexp/constructor_test.dart
diff --git a/tests/corelib/regexp/constructor_test.dart b/tests/corelib/regexp/constructor_test.dart
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+++ b/tests/corelib/regexp/constructor_test.dart
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+// Copyright (c) 2014, the Dart project authors. All rights reserved.
+// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1.  Redistributions of source code must retain the above copyright
+//     notice, this list of conditions and the following disclaimer.
+// 2.  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 with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import 'v8_regexp_utils.dart';
+import 'package:expect/expect.dart';
+
+void main() {
+  description("This test checks use of the regexp constructor.");
+
+  var re = new RegExp(r"abc");
+
+  // We do not guarantee that the same regular expression will or will not be shared.
+  // shouldBeTrue(identical(re, new RegExp(r"abc")));
+  // shouldBeTrue(identical(re, new RegExp(r"abc", caseSensitive: true, multiLine: false)));
+
+  shouldBeFalse(identical(re, new RegExp(r"abc", caseSensitive: false, multiLine: true)));
+  shouldBeFalse(identical(re, new RegExp(r"abc", caseSensitive: true, multiLine: true)));
+  shouldBeFalse(identical(re, new RegExp(r"abc", caseSensitive: false, multiLine: false)));
+}