Make RegExp constructor non-const.

sdk/lib/uri/uri.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.
 
 #library('dart:uri');
 
 #import('dart:math');
 #import('dart:utf');
 
 #source('encode_decode.dart');
@@ skipping 38 matching lines @@
 
   static int _parseIntOrZero(String val) {
     if (val != null && val != '') {
       return int.parse(val);
     } else {
       return 0;
     }
   }
 
   // NOTE: This code was ported from: closure-library/closure/goog/uri/utils.js
-  static const RegExp _splitRe = const RegExp(
+  static final RegExp _splitRe = new RegExp(
       '^'
       '(?:'
         '([^:/?#.]+)'                   // scheme - ignore special characters
                                         // used by other URL parts such as :,
                                         // ?, /, #, and .
       ':)?'
       '(?://'
         '(?:([^/?#]*)@)?'               // userInfo
         '([\\w\\d\\-\\u0100-\\uffff.%]*)'
                                         // domain - restrict to letters,
@@ skipping 160 matching lines @@
   }
 
   static void _addIfNonEmpty(StringBuffer sb, String test,
                              String first, String second) {
     if ("" != test) {
       sb.add(first == null ? "null" : first);
       sb.add(second == null ? "null" : second);
     }
   }
 }