Improve the replaceFirst, replaceAll and split methods.

tests/corelib/src/StringPatternTest.dart

 // 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.
 // Dart test for testing String.allMatches.
 
 String str = "this is a string with hello here and hello there";
 
 main() {
   testNoMatch();
   testOneMatch();
@@ skipping 40 matching lines @@
     Expect.equals(helloPattern, match[0]);
     Expect.equals(0, match.groupCount());
     start = match.end();
   }
   Expect.equals(2, count);
 }
 
 testEmptyPattern() {
   String pattern = "";
   Iterable<Match> matches = pattern.allMatches(str);
-  Expect.isFalse(matches.iterator().hasNext());
+  Expect.isTrue(matches.iterator().hasNext());

[ngeoffray, 2012/03/19 20:13:29]

I believe one of these changes broke the leg bot.

[ngeoffray, 2012/03/19 20:14:15]

%s/leg/dart2js

 }
 
 testEmptyString() {
   String pattern = "foo";
   String str = "";
   Iterable<Match> matches = pattern.allMatches(str);
   Expect.isFalse(matches.iterator().hasNext());
 }
 
 testEmptyPatternAndString() {
   String pattern = "";
   String str = "";
   Iterable<Match> matches = pattern.allMatches(str);
-  Expect.isFalse(matches.iterator().hasNext());
+  Expect.isTrue(matches.iterator().hasNext());
 }