Small cleanups in RegExp to avoid generating lots of code just because there is a try/catch in our …

sdk/lib/collection/collections.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.collection;
 
 /**
  * This class provides default implementations for Iterables (including Lists).
  *
  * Once Dart receives Mixins it will be replaced with mixin classes.
@@ skipping 97 matching lines @@
     for (var element in collection) {
       if (test(element)) elementsToRemove.add(element);
     }
     collection.removeAll(elementsToRemove);
   }
 
   /**
    * Removes elements matching [test] from [list].
    *
    * This is performed in two steps, to avoid exposing an inconsistent state
-   * to the [test] function. First the elements to ratain are found, and then
+   * to the [test] function. First the elements to retain are found, and then
    * the original list is updated to contain those elements.
    */
   static void removeMatchingList(List list, bool test(var element)) {
     List retained = [];
     int length = list.length;
     for (int i = 0; i < length; i++) {
       var element = list[i];
       if (!test(element)) {
         retained.add(element);
       }
@@ skipping 239 matching lines @@
  * The source of the elements may be a [List] or any [Iterable] with
  * efficient [Iterable.length] and [Iterable.elementAt].
  */
 class UnmodifiableListView<E> extends UnmodifiableListBase<E> {
   Iterable<E> _source;
   /** Create an unmodifiable list backed by [source]. */
   UnmodifiableListView(Iterable<E> source) : _source = source;
   int get length => _source.length;
   E operator[](int index) => _source.elementAt(index);
 }