Improve the replaceFirst, replaceAll and split methods.

tests/corelib/src/StringPatternTest.dart

Index: tests/corelib/src/StringPatternTest.dart
diff --git a/tests/corelib/src/StringPatternTest.dart b/tests/corelib/src/StringPatternTest.dart
index a7e07bf63b05c8b4183f9c82876aad47e366dfc3..3fb35337ed0684e21a7efa1d2c508c902d84a293 100644
--- a/tests/corelib/src/StringPatternTest.dart
+++ b/tests/corelib/src/StringPatternTest.dart
@@ -58,7 +58,7 @@ testTwoMatches() {
 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() {
@@ -72,5 +72,5 @@ testEmptyPatternAndString() {
   String pattern = "";
   String str = "";
   Iterable<Match> matches = pattern.allMatches(str);
-  Expect.isFalse(matches.iterator().hasNext());
+  Expect.isTrue(matches.iterator().hasNext());
 }