tests/unit/util/regex.t.cpp

/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013-2023 Regents of the University of California.
 *
 * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
 *
 * ndn-cxx library is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 *
 * You should have received copies of the GNU General Public License and GNU Lesser
 * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
 *
 * @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
 */

#include "ndn-cxx/util/regex.hpp"
#include "ndn-cxx/util/regex/regex-backref-manager.hpp"
#include "ndn-cxx/util/regex/regex-backref-matcher.hpp"
#include "ndn-cxx/util/regex/regex-component-matcher.hpp"
#include "ndn-cxx/util/regex/regex-component-set-matcher.hpp"
#include "ndn-cxx/util/regex/regex-pattern-list-matcher.hpp"
#include "ndn-cxx/util/regex/regex-repeat-matcher.hpp"
#include "ndn-cxx/util/regex/regex-top-matcher.hpp"

#include "tests/boost-test.hpp"

namespace ndn::tests {

using std::string;

BOOST_AUTO_TEST_SUITE(Util)
BOOST_AUTO_TEST_SUITE(TestRegex)

BOOST_AUTO_TEST_CASE(ComponentMatcher)
{
  shared_ptr<RegexBackrefManager> backRef = make_shared<RegexBackrefManager>();
  shared_ptr<RegexComponentMatcher> cm = make_shared<RegexComponentMatcher>("a", backRef);
  bool res = cm->match(Name("/a/b"), 0, 1);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 1);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexComponentMatcher>("a", backRef);
  res = cm->match(Name("/a/b"), 1, 1);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexComponentMatcher>("(c+)\\.(cd)", backRef);
  res = cm->match(Name("/ccc.cd/b"), 0, 1);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 1);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("ccc.cd"));

  BOOST_REQUIRE_EQUAL(backRef->size(), 2);
  BOOST_CHECK_EQUAL(backRef->getBackref(0)->getMatchResult()[0].toUri(), string("ccc"));
  BOOST_CHECK_EQUAL(backRef->getBackref(1)->getMatchResult()[0].toUri(), string("cd"));
}

BOOST_AUTO_TEST_CASE(ComponentSetMatcher)
{
  auto backRef = make_shared<RegexBackrefManager>();
  auto cm = make_shared<RegexComponentSetMatcher>("<a>", backRef);
  bool res = cm->match(Name("/a/b"), 0, 1);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 1);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));

  res = cm->match(Name("/a/b"), 1, 1);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  res = cm->match(Name("/a/b"), 0, 2);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexComponentSetMatcher>("[<a><b><c>]", backRef);
  res = cm->match(Name("/a/b/d"), 1, 1);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 1);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("b"));

  res = cm->match(Name("/a/b/d"), 2, 1);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexComponentSetMatcher>("[^<a><b><c>]", backRef);
  res = cm->match(Name("/b/d"), 1, 1);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 1);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("d"));

  backRef = make_shared<RegexBackrefManager>();
  BOOST_CHECK_THROW(make_shared<RegexComponentSetMatcher>("", backRef), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexComponentSetMatcher>("(<a><b>)", backRef), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexComponentSetMatcher>("[<a><b>", backRef), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexComponentSetMatcher>("<a", backRef), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexComponentSetMatcher>("<a>b", backRef), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexComponentSetMatcher>("<><<>", backRef), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexComponentSetMatcher>("[abc]", backRef), RegexMatcher::Error);
}

BOOST_AUTO_TEST_CASE(RepeatMatcher)
{
  auto backRef = make_shared<RegexBackrefManager>();
  auto cm = make_shared<RegexRepeatMatcher>("[<a><b>]*", backRef, 8);
  bool res = cm->match(Name("/a/b/c"), 0, 0);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  res = cm->match(Name("/a/b/c"), 0, 2);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 2);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexRepeatMatcher>("[<a><b>]+", backRef, 8);
  res = cm->match(Name("/a/b/c"), 0, 0);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  res = cm->match(Name("/a/b/c"), 0, 2);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 2);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexRepeatMatcher>("<.*>*", backRef, 4);
  res = cm->match(Name("/a/b/c/d/e/f"), 0, 6);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 6);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("c"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[3].toUri(), string("d"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[4].toUri(), string("e"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[5].toUri(), string("f"));

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexRepeatMatcher>("<>*", backRef, 2);
  res = cm->match(Name("/a/b/c/d/e/f"), 0, 6);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 6);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("c"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[3].toUri(), string("d"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[4].toUri(), string("e"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[5].toUri(), string("f"));

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexRepeatMatcher>("<a>?", backRef, 3);
  res = cm->match(Name("/a/b/c"), 0, 0);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  cm = make_shared<RegexRepeatMatcher>("<a>?", backRef, 3);
  res = cm->match(Name("/a/b/c"), 0, 1);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 1);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));

  cm = make_shared<RegexRepeatMatcher>("<a>?", backRef, 3);
  res = cm->match(Name("/a/b/c"), 0, 2);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexRepeatMatcher>("[<a><b>]{3}", backRef, 8);
  res = cm->match(Name("/a/b/a/d"), 0, 2);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  res = cm->match(Name("/a/b/a/d"), 0, 3);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 3);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("a"));

  res = cm->match(Name("/a/b/a/d"), 0, 4);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexRepeatMatcher>("[<a><b>]{2,3}", backRef, 8);
  res = cm->match(Name("/a/b/a/d/e"), 0, 2);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 2);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));

  res = cm->match(Name("/a/b/a/d/e"), 0, 3);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 3);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("a"));

  res = cm->match(Name("/a/b/a/b/e"), 0, 4);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  res = cm->match(Name("/a/b/a/d/e"), 0, 1);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexRepeatMatcher>("[<a><b>]{2,}", backRef, 8);
  res = cm->match(Name("/a/b/a/d/e"), 0, 2);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 2);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));

  res = cm->match(Name("/a/b/a/b/e"), 0, 4);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 4);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[3].toUri(), string("b"));

  res = cm->match(Name("/a/b/a/d/e"), 0, 1);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexRepeatMatcher>("[<a><b>]{,2}", backRef, 8);
  res = cm->match(Name("/a/b/a/b/e"), 0, 3);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  res = cm->match(Name("/a/b/a/b/e"), 0, 2);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 2);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));

  res = cm->match(Name("/a/b/a/d/e"), 0, 1);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 1);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));

  res = cm->match(Name("/a/b/a/d/e"), 0, 0);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  backRef = make_shared<RegexBackrefManager>();
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>!", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>@", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>##", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>{}", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>{,}", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>1,2", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>{foo,bar}", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>{0x12,0x34}", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>{10,5}", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>{99999999999999999999,}", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>{,99999999999999999999}", backRef, 2), RegexMatcher::Error);
  BOOST_CHECK_THROW(make_shared<RegexRepeatMatcher>("<>{1,2,3}", backRef, 2), RegexMatcher::Error);
}

BOOST_AUTO_TEST_CASE(BackrefMatcher)
{
  auto backRef = make_shared<RegexBackrefManager>();
  auto cm = make_shared<RegexBackrefMatcher>("(<a><b>)", backRef);
  backRef->pushRef(std::static_pointer_cast<RegexMatcher>(cm));
  cm->compile();
  bool res = cm->match(Name("/a/b/c"), 0, 2);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 2);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), "a");
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), "b");
  BOOST_CHECK_EQUAL(backRef->size(), 1);

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexBackrefMatcher>("(<a>(<b>))", backRef);
  backRef->pushRef(cm);
  cm->compile();
  res = cm->match(Name("/a/b/c"), 0, 2);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 2);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), "a");
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), "b");
  BOOST_CHECK_EQUAL(backRef->size(), 2);
  BOOST_CHECK_EQUAL(backRef->getBackref(0)->getMatchResult()[0].toUri(), "a");
  BOOST_CHECK_EQUAL(backRef->getBackref(0)->getMatchResult()[1].toUri(), "b");
  BOOST_CHECK_EQUAL(backRef->getBackref(1)->getMatchResult()[0].toUri(), "b");

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexBackrefMatcher>("", backRef);
  BOOST_CHECK_THROW(cm->compile(), RegexMatcher::Error);
  cm = make_shared<RegexBackrefMatcher>("(", backRef);
  BOOST_CHECK_THROW(cm->compile(), RegexMatcher::Error);
  cm = make_shared<RegexBackrefMatcher>("(<a><b>", backRef);
  BOOST_CHECK_THROW(cm->compile(), RegexMatcher::Error);
  cm = make_shared<RegexBackrefMatcher>("[<a><b>)", backRef);
  BOOST_CHECK_THROW(cm->compile(), RegexMatcher::Error);
}

BOOST_AUTO_TEST_CASE(BackrefMatcherAdvanced)
{
  auto backRef = make_shared<RegexBackrefManager>();
  shared_ptr<RegexMatcher> cm = make_shared<RegexRepeatMatcher>("([<a><b>])+", backRef, 10);
  bool res = cm->match(Name("/a/b/c"), 0, 2);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 2);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), "a");
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), "b");
  BOOST_CHECK_EQUAL(backRef->size(), 1);
  BOOST_CHECK_EQUAL(backRef->getBackref(0)->getMatchResult()[0].toUri(), "b");

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexPatternListMatcher>("(<a>(<b>))<c>", backRef);
  res = cm->match(Name("/a/b/c"), 0, 3);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 3);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), "a");
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), "b");
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), "c");
  BOOST_CHECK_EQUAL(backRef->size(), 2);
  BOOST_CHECK_EQUAL(backRef->getBackref(0)->getMatchResult()[0].toUri(), "a");
  BOOST_CHECK_EQUAL(backRef->getBackref(0)->getMatchResult()[1].toUri(), "b");
  BOOST_CHECK_EQUAL(backRef->getBackref(1)->getMatchResult()[0].toUri(), "b");
}

BOOST_AUTO_TEST_CASE(PatternListMatcher)
{
  shared_ptr<RegexBackrefManager> backRef = make_shared<RegexBackrefManager>();
  shared_ptr<RegexPatternListMatcher> cm = make_shared<RegexPatternListMatcher>("<a>[<a><b>]", backRef);
  bool res = cm->match(Name("/a/b/c"), 0, 2);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 2);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexPatternListMatcher>("<>*<a>", backRef);
  res = cm->match(Name("/a/b/c"), 0, 1);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 1);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexPatternListMatcher>("<>*<a>", backRef);
  res = cm->match(Name("/a/b/c"), 0, 2);
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  backRef = make_shared<RegexBackrefManager>();
  cm = make_shared<RegexPatternListMatcher>("<>*<a><>*", backRef);
  res = cm->match(Name("/a/b/c"), 0, 3);
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 3);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("c"));
}

BOOST_AUTO_TEST_CASE(TopMatcher)
{
  shared_ptr<RegexTopMatcher> cm = make_shared<RegexTopMatcher>("^<a><b><c>");
  bool res = cm->match(Name("/a/b/c/d"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 4);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("c"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[3].toUri(), string("d"));

  cm = make_shared<RegexTopMatcher>("<b><c><d>$");
  res = cm->match(Name("/a/b/c/d"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 4);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("c"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[3].toUri(), string("d"));

  cm = make_shared<RegexTopMatcher>("^<a><b><c><d>$");
  res = cm->match(Name("/a/b/c/d"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 4);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("c"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[3].toUri(), string("d"));

  res = cm->match(Name("/a/b/c/d/e"));
  BOOST_CHECK_EQUAL(res, false);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 0);

  cm = make_shared<RegexTopMatcher>("<a><b><c><d>");
  res = cm->match(Name("/a/b/c/d"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 4);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("c"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[3].toUri(), string("d"));

  cm = make_shared<RegexTopMatcher>("<b><c>");
  res = cm->match(Name("/a/b/c/d"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 4);
  BOOST_CHECK_EQUAL(cm->getMatchResult()[0].toUri(), string("a"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[1].toUri(), string("b"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[2].toUri(), string("c"));
  BOOST_CHECK_EQUAL(cm->getMatchResult()[3].toUri(), string("d"));
}

BOOST_AUTO_TEST_CASE(TopMatcherAdvanced)
{
  shared_ptr<Regex> cm = make_shared<Regex>("^(<.*>*)<.*>");
  bool res = cm->match(Name("/n/a/b/c"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 4);
  BOOST_CHECK_EQUAL(cm->expand("\\1"), Name("/n/a/b/"));

  cm = make_shared<Regex>("^(<.*>*)<.*><c>(<.*>)<.*>");
  res = cm->match(Name("/n/a/b/c/d/e/"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 6);
  BOOST_CHECK_EQUAL(cm->expand("\\1\\2"), Name("/n/a/d/"));

  cm = make_shared<Regex>("(<.*>*)<.*>$");
  res = cm->match(Name("/n/a/b/c/"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 4);
  BOOST_CHECK_EQUAL(cm->expand("\\1"), Name("/n/a/b/"));

  cm = make_shared<Regex>("<.*>(<.*>*)<.*>$");
  res = cm->match(Name("/n/a/b/c/"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 4);
  BOOST_CHECK_EQUAL(cm->expand("\\1"), Name("/a/b/"));

  cm = make_shared<Regex>("<a>(<>*)<>$");
  res = cm->match(Name("/n/a/b/c/"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 4);
  BOOST_CHECK_EQUAL(cm->expand("\\1"), Name("/b/"));

  cm = make_shared<Regex>("^<ndn><(.*)\\.(.*)><DNS>(<>*)<>");
  res = cm->match(Name("/ndn/ucla.edu/DNS/yingdi/mac/ksk-1/"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 6);
  BOOST_CHECK_EQUAL(cm->expand("<ndn>\\2\\1\\3"), Name("/ndn/edu/ucla/yingdi/mac/"));

  cm = make_shared<Regex>("^<ndn><(.*)\\.(.*)><DNS>(<>*)<>", "<ndn>\\2\\1\\3");
  res = cm->match(Name("/ndn/ucla.edu/DNS/yingdi/mac/ksk-1/"));
  BOOST_CHECK_EQUAL(res, true);
  BOOST_CHECK_EQUAL(cm->getMatchResult().size(), 6);
  BOOST_CHECK_EQUAL(cm->expand(), Name("/ndn/edu/ucla/yingdi/mac/"));
}

BOOST_AUTO_TEST_CASE(RegexBackrefManagerMemoryLeak)
{
  auto re = make_unique<Regex>("^(<>)$");

  weak_ptr<RegexPatternListMatcher> m1(re->m_primaryMatcher);
  weak_ptr<RegexPatternListMatcher> m2(re->m_secondaryMatcher);
  weak_ptr<RegexBackrefManager> b1(re->m_primaryBackrefManager);
  weak_ptr<RegexBackrefManager> b2(re->m_secondaryBackrefManager);

  re.reset();

  BOOST_CHECK_EQUAL(m1.use_count(), 0);
  BOOST_CHECK_EQUAL(m2.use_count(), 0);
  BOOST_CHECK_EQUAL(b1.use_count(), 0);
  BOOST_CHECK_EQUAL(b2.use_count(), 0);
}

BOOST_AUTO_TEST_SUITE_END() // TestRegex
BOOST_AUTO_TEST_SUITE_END() // Util

} // namespace ndn::tests