chromium/third_party/re2/src/re2/filtered_re2.h

// Copyright 2009 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_FILTERED_RE2_H_
#define RE2_FILTERED_RE2_H_

// The class FilteredRE2 is used as a wrapper to multiple RE2 regexps.
// It provides a prefilter mechanism that helps in cutting down the
// number of regexps that need to be actually searched.
//
// By design, it does not include a string matching engine. This is to
// allow the user of the class to use their favorite string matching
// engine. The overall flow is: Add all the regexps using Add, then
// Compile the FilteredRE2. Compile returns strings that need to be
// matched. Note that the returned strings are lowercased and distinct.
// For applying regexps to a search text, the caller does the string
// matching using the returned strings. When doing the string match,
// note that the caller has to do that in a case-insensitive way or
// on a lowercased version of the search text. Then call FirstMatch
// or AllMatches with a vector of indices of strings that were found
// in the text to get the actual regexp matches.

#include <memory>
#include <string>
#include <vector>

#include "absl/strings/string_view.h"
#include "re2/re2.h"

namespace re2 {

class PrefilterTree;

class FilteredRE2 { … };

}  // namespace re2

#endif  // RE2_FILTERED_RE2_H_