Fix finding locale from OS on Windows

pkg/intl/intl_standalone.dart

 // Copyright (c) 2012, 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.
 
 /**
  * This provides facilities for Internationalization that are only available
  * when running standalone. You should import only one of this or
  * intl_browser.dart. Right now the only thing provided here is finding
  * the operating system locale.
  */
@@ skipping 33 matching lines @@
     return _getAppleDefaults();
   }
   // We can't find anything, don't set the system locale and return null.
   return new Future.immediate(null);
 }
 
 /**
  * Regular expression to match the expected output of systeminfo on
  * Windows. e.g. System Locale:<tab>en_US;English (United States)
  */
-RegExp _sysInfoRegex = const RegExp(@"System Locale:\t(\w\w-\w+);");
+RegExp _sysInfoRegex = const RegExp(@"System Locale:\s+(\w\w-\w+);");
 
 /**
  * Regular expression to match the expected output of reading the defaults
  * database for AppleLanguages on Mac systems.
  * e.g. {
  *     en,
  *     "pt-PT",
  *     ...
  */
 RegExp _appleDefaultsRegex = const RegExp(@'(\w\w_\w+)');
@@ skipping 42 matching lines @@
   return new Future.immediate(locale);
 }
 
 /**
  * Set [Intl.systemLocale] to be the canonicalizedLocale of [aLocale].
  */
 Future<String> _setLocale(aLocale) {
   Intl.systemLocale = Intl.canonicalizedLocale(aLocale);
   return new Future.immediate(Intl.systemLocale);
 }