File: lookahead.pass.cpp

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <regex>

// template <class BidirectionalIterator, class Allocator, class charT, class traits>
//     bool
//     regex_search(BidirectionalIterator first, BidirectionalIterator last,
//                  match_results<BidirectionalIterator, Allocator>& m,
//                  const basic_regex<charT, traits>& e,
//                  regex_constants::match_flag_type flags = regex_constants::match_default);

// https://llvm.org/PR11118

#include <regex>
#include <cassert>
#include "test_macros.h"

int main(int, char**)
{
    assert(!std::regex_search("ab", std::regex("(?=^)b")));
    assert(!std::regex_search("ab", std::regex("a(?=^)b")));

  return 0;
}