autofill: switch autofill_regexes to RE2 library

components/autofill/core/browser/validation.cc

Index: components/autofill/core/browser/validation.cc
diff --git a/components/autofill/core/browser/validation.cc b/components/autofill/core/browser/validation.cc
index b4c95674ebad46c819e0bbf4881977a180d3d004..060a3724ac050c6245ba5bb2c4c9e60187fc815e 100644
--- a/components/autofill/core/browser/validation.cc
+++ b/components/autofill/core/browser/validation.cc
@@ -127,10 +127,9 @@ bool IsValidCreditCardSecurityCode(const base::string16& code,
 
 bool IsValidEmailAddress(const base::string16& text) {
   // E-Mail pattern as defined by the WhatWG. (4.10.7.1.5 E-Mail state)
-  const base::string16 kEmailPattern = base::ASCIIToUTF16(
-      "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@"
-      "[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$");
-  return MatchesPattern(text, kEmailPattern);
+  const char kEmailPattern[] =
+      "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$";
+  return MatchesPattern(base::UTF16ToASCII(text), kEmailPattern);

[Ilya Sherman, 2015/11/19 02:09:00]

Please note: UTF16ToASCII is generally unsafe for user-provided data.  Instead,
you should use UTF16ToUTF8.

That said, this shouldn't be relevant for this CL, as you should simply preserve
the string16 type for the |input| parameter.

 }
 
 bool IsValidState(const base::string16& text) {
@@ -139,8 +138,8 @@ bool IsValidState(const base::string16& text) {
 }
 
 bool IsValidZip(const base::string16& text) {
-  const base::string16 kZipPattern = base::ASCIIToUTF16("^\\d{5}(-\\d{4})?$");
-  return MatchesPattern(text, kZipPattern);
+  const char kZipPattern[] = "^\\d{5}(-\\d{4})?$";
+  return MatchesPattern(base::UTF16ToASCII(text), kZipPattern);
 }
 
 bool IsSSN(const base::string16& text) {