Migrated test block 19 to Dart 2.0.

tests/corelib/reg_exp_has_match_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.
-
-import "package:expect/expect.dart";
-
-// Dart test program for RegExp.hasMatch.
-
-class RegExpHasMatchTest {
-  static testMain() {
-    Expect.equals(false, new RegExp("bar").hasMatch("foo"));
-    Expect.equals(true, new RegExp("bar|foo").hasMatch("foo"));
-    Expect.equals(true, new RegExp("o+").hasMatch("foo"));
-  }
-}
-
-main() {
-  RegExpHasMatchTest.testMain();
-}