test rename overhaul: step 8 - language tests

tests/language/reg_exp2_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 RegExp2Test {
   static String findImageTag_(String text, String extensions) {
     final re = new RegExp('src="(http://\\S+\\.(${extensions}))"');
     print('REGEXP findImageTag_ ' + extensions + ' text: \n' + text);
     final match = re.firstMatch(text);
@@ skipping 12 matching lines @@
 ''';
    String extensions = 'jpg|jpeg|png';
    String tag = findImageTag_(text, extensions);
    Expect.equals(true, tag !== null);
  }
 }
 
 main() {
   RegExp2Test.testMain();
 }