Spelling fixes e to i.

tests/corelib/regexp/invalid-range-in-class_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 26 matching lines @@
 
   // A character-class in a range is invalid, according to ECMA-262, but we allow it.
   shouldBe(new RegExp(r"[\d-x]+").firstMatch("1-3xy"), ["1-3x"]);
   shouldBe(new RegExp(r"[x-\d]+").firstMatch("1-3xy"), ["1-3x"]);
   shouldBe(new RegExp(r"[\\d-\d]+").firstMatch("1-3xy"), ["1-3"]);
 
   // Whilst we break with ECMA-262's definition of CharacterRange, we do comply with
   // the grammar, and as such in the following regex a-z cannot be matched as a range.
   shouldBe(new RegExp(r"[\d-a-z]+").firstMatch("az1-3y"), ["az1-3"]);
 
-  // An escaped hypen should not be confused for an invalid range.
+  // An escaped hyphen should not be confused for an invalid range.
   shouldBe(new RegExp(r"[\d\-x]+").firstMatch("1-3xy"), ["1-3x"]);
   shouldBe(new RegExp(r"[x\-\d]+").firstMatch("1-3xy"), ["1-3x"]);
   shouldBe(new RegExp(r"[\d\-\d]+").firstMatch("1-3xy"), ["1-3"]);
 
   // A hyphen after a character-class is not invalid.
   shouldBe(new RegExp(r"[\d-]+").firstMatch("1-3xy"), ["1-3"]);
 }