Rename regexp methods to getters.

tests/language/reg_ex2_test.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 regular expressions in Dart.
 
 class RegEx2Test {
   static void testMain() {
     final helloPattern = new RegExp("with (hello)");
     String s = "this is a string with hello somewhere";
     Match match = helloPattern.firstMatch(s);
     if (match != null) {
       print("got match");
-      int groupCount = match.groupCount();
+      int groupCount = match.groupCount;
       print("groupCount is $groupCount");
       print("group 0 is ${match.group(0)}");
       print("group 1 is ${match.group(1)}");
     } else {
       print("match not round");
     }
     print("done");
   }
 }
 
 main() {
   RegEx2Test.testMain();
 }