Dart SDK Spelling b, c, and d.

tests/corelib_strong/regexp/regress-regexp-codeflush_test.dart

 // Copyright (c) 2014, the Dart project authors. All rights reserved.
 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
@@ skipping 18 matching lines @@
 import 'v8_regexp_utils.dart';
 import 'package:expect/expect.dart';
 
 void main() {
   // Flags: --gc_global
 
   // Regression test for regexp that has multiple matches and which
   // internally calls RegExpImpl::IrregexpExecOnce more than once without
   // ensuring that the regexp is compiled.
   // This can create a crash if the code was exchanged with the sweep
-  // generation (for code flushing support) in GC durring the matching.
+  // generation (for code flushing support) in GC during the matching.
 
   var re = new RegExp('(s)');
 
   dynamic foo(Match m) {
     return "42";
   }
 
   // Run enough times to get a number of GC's (all mark sweep because of the
   // --gc_global) flag.
   for (var i = 0; i < 10; i++) {
     // Make a long string with plenty of matches for re.
     var x = "s foo s bar s foo s bar s";
     x = x + x;
     x = x + x;
     x = x + x;
     x = x + x;
     x = x + x;
     x = x + x;
     x = x + x;
     x.replaceAllMapped(re, foo);
   }
 }