Fix a RegExp in analyzer_experimental/test/utils for Windows.

pkg/analyzer_experimental/test/utils.dart

 // Copyright (c) 2013, 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.
 
 library utils;
 
 import 'dart:io';
 
 import 'package:analyzer_experimental/analyzer.dart';
 import 'package:pathos/path.dart' as pathos;
 
 /// Returns the string representation of the [AnalyzerErrorGroup] thrown when
 /// parsing [contents] as a Dart file. If [contents] doesn't throw any errors,
 /// this will return null.
 ///
 /// This replaces the filename in the error string with its basename, since the
 /// full path will vary from machine to machine. It also replaces the exception
 /// message with "..." to decouple these tests from the specific exception
 /// messages.
 String errorsForFile(String contents) {
   return withTempDir((temp) {
     var path = pathos.join(temp, 'test.dart');
     new File(path).writeAsStringSync(contents);
     try {
       parseDartFile(path);
     } on AnalyzerErrorGroup catch (e) {
       return e.toString().replaceAllMapped(
-          new RegExp(r"^(Error on line \d+ of )([^:]+): .*$", multiLine: true),
+          new RegExp(r"^(Error on line \d+ of )((?:[A-Z]+:)?[^:]+): .*$",
+                     multiLine: true),
           (match) => match[1] + pathos.basename(match[2]) + ': ...');
     }
     return null;
   });
 }
 
 /// Creates a temporary directory and passes its path to [fn]. Once [fn]
 /// completes, the temporary directory and all its contents will be deleted.
 ///
 /// Returns the return value of [fn].
 dynamic withTempDir(fn(String path)) {
   var tempDir = new Directory('').createTempSync().path;
   try {
     return fn(tempDir);
   } finally {
     new Directory(tempDir).deleteSync(recursive: true);
   }
 }