Migrated test block 22 to Dart 2.0

tests/corelib_2/regexp/pcre-test-4_test.dart

 // 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
@@ skipping 1011 matching lines @@
   Expect.listEquals(allStringMatches(input1, regexGlobal28), results);
 
   var regexGlobal29 = new RegExp(r"(a|)");
   input0 = "catac";
   results = ["", "a", "", "a", "", ""];
   Expect.listEquals(allStringMatches(input0, regexGlobal29), results);
   input1 = "a\u0256a";
   results = ["a", "", "a", ""];
   Expect.listEquals(allStringMatches(input1, regexGlobal29), results);
 }