Add corelib tests

test/codegen/corelib/reg_exp_start_end_test.dart

Index: test/codegen/corelib/reg_exp_start_end_test.dart
diff --git a/test/codegen/corelib/reg_exp_start_end_test.dart b/test/codegen/corelib/reg_exp_start_end_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e905275a8c9fbd984532b8427d34ceb0755ef372
--- /dev/null
+++ b/test/codegen/corelib/reg_exp_start_end_test.dart
@@ -0,0 +1,20 @@
+// Copyright (c) 2011, 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 "package:expect/expect.dart";
+
+main() {
+  var matches =
+      new RegExp("(a(b)((c|de)+))").allMatches("abcde abcde abcde");
+  var it = matches.iterator;
+  int start = 0;
+  int end = 5;
+  while (it.moveNext()) {
+    Match match = it.current;
+    Expect.equals(start, match.start);
+    Expect.equals(end, match.end);
+    start += 6;
+    end += 6;
+  }
+}