Replace RE2 import with a dependency

third_party/re2/re2/set.h

-// Copyright 2010 The RE2 Authors.  All Rights Reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-#ifndef RE2_SET_H
-#define RE2_SET_H
-
-#include <utility>
-#include <vector>
-
-#include "re2/re2.h"
-
-namespace re2 {
-using std::vector;
-
-// An RE2::Set represents a collection of regexps that can
-// be searched for simultaneously.
-class RE2::Set {
- public:
-  Set(const RE2::Options& options, RE2::Anchor anchor);
-  ~Set();
-
-  // Add adds regexp pattern to the set, interpreted using the RE2 options.
-  // (The RE2 constructor's default options parameter is RE2::UTF8.)
-  // Add returns the regexp index that will be used to identify
-  // it in the result of Match, or -1 if the regexp cannot be parsed.
-  // Indices are assigned in sequential order starting from 0.
-  // Error returns do not increment the index.
-  // If an error occurs and error != NULL, *error will hold an error message.
-  int Add(const StringPiece& pattern, string* error);
-
-  // Compile prepares the Set for matching.
-  // Add must not be called again after Compile.
-  // Compile must be called before FullMatch or PartialMatch.
-  // Compile may return false if it runs out of memory.
-  bool Compile();
-
-  // Match returns true if text matches any of the regexps in the set.
-  // If so, it fills v with the indices of the matching regexps.
-  bool Match(const StringPiece& text, vector<int>* v) const;
-
- private:
-  RE2::Options options_;
-  RE2::Anchor anchor_;
-  vector<re2::Regexp*> re_;
-  re2::Prog* prog_;
-  bool compiled_;
-  //DISALLOW_COPY_AND_ASSIGN(Set);
-  Set(const Set&);
-  void operator=(const Set&);
-};
-
-}  // namespace re2
-
-#endif  // RE2_SET_H