Fix regex for last name field in Autofill.

components/autofill/core/browser/autofill_regex_constants.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains UTF8 strings that we want as char arrays.  To avoid
 // different compilers, we use a script to convert the UTF8 strings into
 // numeric literals (\x##).
 
 #include "components/autofill/core/browser/autofill_regex_constants.h"
 
@@ skipping 245 matching lines @@
     "|apellido.?materno|lastlastname";  // es
 const char kLastNameRe[] =
     "last.*name|lname|surname|last$|secondname|family.*name"
     "|nachname"  // de-DE
     "|apellido"  // es
     "|famille|^nom"  // fr-FR
     "|cognome"  // it-IT
     "|姓"  // ja-JP
     "|morada|apelidos|surename|sobrenome"  // pt-BR, pt-PT
     "|Фамилия"  // ru
-    "|성[^명]?";  // ko-KR
+    "|\\b성(?:[^명]|\\b)";  // ko-KR
 
 /////////////////////////////////////////////////////////////////////////////
 // phone_field.cc
 /////////////////////////////////////////////////////////////////////////////
 const char kPhoneRe[] =
     "phone|mobile|contact.?number"
     "|telefonnummer"                                // de-DE
     "|telefono|teléfono"                            // es
     "|telfixe"                                      // fr-FR
     "|電話"                                         // ja-JP
@@ skipping 16 matching lines @@
     "prefix|exchange"
     "|preselection"  // fr-FR
     "|ddd";  // pt-BR, pt-PT
 const char kPhoneSuffixRe[] =
     "suffix";
 const char kPhoneExtensionRe[] =
     "\\bext|ext\\b|extension"
     "|ramal";  // pt-BR, pt-PT
 
 }  // namespace autofill