Revert 5911 (RegExp fail on invalid range syntax).

test/cctest/test-regexp.cc

 // Copyright 2008 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
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 155 matching lines @@
   CHECK_PARSE_EQ("[x]", "[x]");
   CHECK_PARSE_EQ("[xyz]", "[x y z]");
   CHECK_PARSE_EQ("[a-zA-Z0-9]", "[a-z A-Z 0-9]");
   CHECK_PARSE_EQ("[-123]", "[- 1 2 3]");
   CHECK_PARSE_EQ("[^123]", "^[1 2 3]");
   CHECK_PARSE_EQ("]", "']'");
   CHECK_PARSE_EQ("}", "'}'");
   CHECK_PARSE_EQ("[a-b-c]", "[a-b - c]");
   CHECK_PARSE_EQ("[\\d]", "[0-9]");
   CHECK_PARSE_EQ("[x\\dz]", "[x 0-9 z]");
+  CHECK_PARSE_EQ("[\\d-z]", "[0-9 - z]");
+  CHECK_PARSE_EQ("[\\d-\\d]", "[0-9 - 0-9]");
+  CHECK_PARSE_EQ("[z-\\d]", "[z - 0-9]");
   CHECK_PARSE_EQ("\\cj\\cJ\\ci\\cI\\ck\\cK",
                  "'\\x0a\\x0a\\x09\\x09\\x0b\\x0b'");
   CHECK_PARSE_EQ("\\c!", "'c!'");
   CHECK_PARSE_EQ("\\c_", "'c_'");
   CHECK_PARSE_EQ("\\c~", "'c~'");
   CHECK_PARSE_EQ("[a\\]c]", "[a ] c]");
   CHECK_PARSE_EQ("\\[\\]\\{\\}\\(\\)\\%\\^\\#\\ ", "'[]{}()%^# '");
   CHECK_PARSE_EQ("[\\[\\]\\{\\}\\(\\)\\%\\^\\#\\ ]", "[[ ] { } ( ) % ^ #  ]");
   CHECK_PARSE_EQ("\\0", "'\\x00'");
   CHECK_PARSE_EQ("\\8", "'8'");
@@ skipping 1587 matching lines @@
     bool in_second = CharacterInSet(&l2, i);
     CHECK((in_first || in_second) == CharacterInSet(&all, i));
   }
 }
 
 
 TEST(Graph) {
   V8::Initialize(NULL);
   Execute("\\b\\w+\\b", false, true, true);
 }