test rename overhaul: step 7 - corelib tests

tests/corelib/src/RegExpFirstMatchTest.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 program for RegExp.firstMatch.
-
-class RegExpFirstMatchTest {
-  static testMain() {
-    Expect.equals('cat', new RegExp("(\\w+)").firstMatch("cat dog")[0]);
-    Expect.equals(null, new RegExp("foo").firstMatch("bar"));
-  }
-}
-
-main() {
-  RegExpFirstMatchTest.testMain();
-}