Add optional start index to Pattern.allMatches.

sdk/lib/core/regexp.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.
 
 part of dart.core;
 
 /**
  * A result from searching within a string.
  *
  * A Match or an [Iterable] of Match objects is returned from [Pattern]
@@ skipping 117 matching lines @@
                                           bool caseSensitive: true});
 
   /**
    * Searches for the first match of the regular expression
    * in the string [input]. Returns `null` if there is no match.
    */
   Match firstMatch(String input);
 
   /**
    * Returns an iterable of the matches of the regular expression on [input].
+   *
+   * If [start] is provided, only start looking for matches at `start`.
    */
-  Iterable<Match> allMatches(String input);
+  Iterable<Match> allMatches(String input, [int start = 0]);
 
   /**
    * Returns whether the regular expression has a match in the string [input].
    */
   bool hasMatch(String input);
 
   /**
    * Returns the first substring match of this regular expression in [input].
    */
   String stringMatch(String input);
@@ skipping 14 matching lines @@
 
   /**
    * Whether this regular expression is case sensitive.
    *
    * If the regular expression is not case sensitive, it will match an input
    * letter with a pattern letter even if the two letters are different case
    * versions of the same letter.
    */
   bool get isCaseSensitive;
 }