Fix split with regexp for frog.

tests/corelib/src/StringSplitRegExpTest.dart

Index: tests/corelib/src/StringSplitRegExpTest.dart
diff --git a/tests/corelib/src/StringSplitRegExpTest.dart b/tests/corelib/src/StringSplitRegExpTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..54728384d64f3d1533060d20189a9ae8d73c387e
--- /dev/null
+++ b/tests/corelib/src/StringSplitRegExpTest.dart
@@ -0,0 +1,45 @@
+// Copyright (c) 2012, 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.
+
+main() {
+  var list = "a b c".split(const RegExp(" "));
+  Expect.equals(3, list.length);
+  Expect.equals("a", list[0]);
+  Expect.equals("b", list[1]);
+  Expect.equals("c", list[2]);
+
+  list = "adbdc".split(const RegExp("[dz]"));
+  Expect.equals(3, list.length);
+  Expect.equals("a", list[0]);
+  Expect.equals("b", list[1]);
+  Expect.equals("c", list[2]);
+
+  list = "addbddc".split(new RegExp("dd"));
+  Expect.equals(3, list.length);
+  Expect.equals("a", list[0]);
+  Expect.equals("b", list[1]);
+  Expect.equals("c", list[2]);
+
+  list = "abc".split(new RegExp(@"b$"));
+  Expect.equals(1, list.length);
+  Expect.equals("abc", list[0]);
+
+  list = "abc".split(new RegExp(""));
+  Expect.equals(3, list.length);
+  Expect.equals("a", list[0]);
+  Expect.equals("b", list[1]);
+  Expect.equals("c", list[2]);
+
+  list = "   ".split(new RegExp("[ ]"));
+  Expect.equals(4, list.length);
+  Expect.equals("", list[0]);
+  Expect.equals("", list[1]);
+  Expect.equals("", list[2]);
+  Expect.equals("", list[3]);
+
+  list = "aaa".split(const RegExp(@"a$"));
+  Expect.equals(2, list.length);
+  Expect.equals("aa", list[0]);
+  Expect.equals("", list[1]);
+}