Rename Match.str to input.

runtime/lib/regexp_patch.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.
 
 patch class RegExp {
-  /* patch */ factory RegExp(String pattern,
+  /* patch */ factory RegExp(String source,
                              {bool multiLine: false,
                               bool caseSensitive: true}) {
-    return new _JSSyntaxRegExp(pattern,
+    return new _JSSyntaxRegExp(source,
                                multiLine: multiLine,
                                caseSensitive: caseSensitive);
   }
 }
 
 class _JSRegExpMatch implements Match {
   _JSRegExpMatch(this._regexp, this.str, this._match);
 
   int get start => _start(0);
   int get end => _end(0);
@@ skipping 134 matching lines @@
     var match = _re._ExecuteMatch(_str, nextIndex);
     if (match == null) {
       _current = null;
       _re = null;
       return false;
     }
     _current = new _JSRegExpMatch(_re, _str, match);
     return true;
   }
 }