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diff --git a/third_party/libphonenumber/cpp/src/regexp_adapter.h b/third_party/libphonenumber/cpp/src/regexp_adapter.h
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+// Copyright (C) 2011 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Author: George Yakovlev
+
+#ifndef I18N_PHONENUMBERS_REGEXP_ADAPTER_H_
+#define I18N_PHONENUMBERS_REGEXP_ADAPTER_H_
+
+#include <string>
+
+// Regexp adapter to allow pluggable regexp engine, as it is external to
+// libphonenumber.
+
+namespace reg_exp {
+
+// The reg exp input class.
+// It supports only functions used in phonelibrary.
+class RegularExpressionInput {
+ public:
+  virtual ~RegularExpressionInput() {};
+  
+  // Matches string to regular expression, returns true if expression was
+  // matched, false otherwise, advances position in the match.
+  // |reg_exp| - expression to be matched.
+  // |beginning_only| - if true match would be successfull only if appears at
+  // the beginning of the tested region of the string.
+  // |matched_string1| - successfully matched first string. Can be NULL.
+  // |matched_string2| - successfully matched second string. Can be NULL.
+  virtual bool ConsumeRegExp(std::string const& reg_exp,
+                             bool beginning_only,
+                             std::string* matched_string1,
+                             std::string* matched_string2) = 0;
+  // Convert unmatched input to a string.
+  virtual std::string ToString() const = 0;
+};
+
+// The regular expression class.
+// It supports only functions used in phonelibrary.
+class RegularExpression {
+ public:
+  RegularExpression() {}
+  virtual ~RegularExpression() {}
+
+  // Matches string to regular expression, returns true if expression was
+  // matched, false otherwise, advances position in the match.
+  // |input_string| - string to be searched.
+  // |beginning_only| - if true match would be successfull only if appears at
+  // the beginning of the tested region of the string.
+  // |matched_string1| - successfully matched first string. Can be NULL.
+  // |matched_string2| - successfully matched second string. Can be NULL.
+  // |matched_string3| - successfully matched third string. Can be NULL.
+  virtual bool Consume(RegularExpressionInput* input_string,
+                       bool beginning_only,
+                       std::string* matched_string1 = NULL,
+                       std::string* matched_string2 = NULL,
+                       std::string* matched_string3 = NULL) const = 0;
+
+
+  // Matches string to regular expression, returns true if expression was
+  // matched, false otherwise.
+  // |input_string| - string to be searched.
+  // |full_match| - if true match would be successfull only if it matches the
+  // complete string.
+  // |matched_string| - successfully matched string. Can be NULL.
+  virtual bool Match(const char* input_string,
+                     bool full_match,
+                     std::string* matched_string) const = 0;
+
+  // Replaces match(es) in the |string_to_process|. if |global| is true,
+  // replaces all the matches, only the first match otherwise.
+  // |replacement_string| - text the matches are replaced with.
+  // Returns true if expression successfully processed through the string,
+  // even if no actual replacements were made. Returns false in case of an
+  // error.
+  virtual bool Replace(std::string* string_to_process,
+                       bool global,
+                       const char* replacement_string) const = 0;
+};
+
+RegularExpressionInput* CreateRegularExpressionInput(const char* utf8_input);
+RegularExpression* CreateRegularExpression(const char* utf8_regexp);
+
+}  // namespace reg_exp
+
+#endif  // I18N_PHONENUMBERS_REGEXP_ADAPTER_H_