Dart SDK Spelling b, c, and d.

tests/corelib/regexp/ranges-and-escaped-hyphens_test.dart

 // Copyright (c) 2014, the Dart project authors. All rights reserved.
 // Copyright 2013 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 // 1.  Redistributions of source code must retain the above copyright
 //     notice, this list of conditions and the following disclaimer.
 // 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 29 matching lines @@
   // These are invalid ranges, according to ECMA-262, but we allow them.
   var regexp01b = new RegExp(r"[1\s-35]+").firstMatch("21-3 54");
   shouldBe(regexp01b, ["1-3 5"]);
   var regexp01c = new RegExp(r"[1-\s35]+").firstMatch("21-3 54");
   shouldBe(regexp01c, ["1-3 5"]);
 
   var regexp01d = new RegExp(r"[1-3\s5]+").firstMatch("-123 54");
   shouldBe(regexp01d, ["123 5"]);
   var regexp01e = new RegExp(r"[1-35\s5]+").firstMatch("-123 54");
   shouldBe(regexp01e, ["123 5"]);
-  // hyphens are normal charaters if a range is not fully specified.
+  // hyphens are normal characters if a range is not fully specified.
   var regexp01f = new RegExp(r"[-3]+").firstMatch("2-34");
   shouldBe(regexp01f, ["-3"]);
   var regexp01g = new RegExp(r"[2-]+").firstMatch("12-3");
   shouldBe(regexp01g, ["2-"]);
 
   // Similar to the above tests, but where the hyphen is escaped this is never a range.
   var regexp02 = new RegExp(r"[1\-35]+").firstMatch("21-354");
   shouldBe(regexp02, ["1-35"]);
   // As above.
   var regexp02a = new RegExp(r"[\s1\-35]+").firstMatch("21-3 54");
@@ skipping 11 matching lines @@
   var regexp03a = new RegExp(r"[\--0]+").firstMatch(",-.01");
   shouldBe(regexp03a, ["-.0"]);
   var regexp03b = new RegExp(r"[+-\-]+").firstMatch("*+,-.");
   shouldBe(regexp03b, ["+,-"]);
 
   // The actual bug reported.
   var bug21232 =
       (new RegExp(r"^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$")).hasMatch('@');
   shouldBeFalse(bug21232);
 }