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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>
// match_not_null:
// The regular expression shall not match an empty sequence.
#include "test_macros.h"
#include <cassert>
#include <regex>
int main(int, char**)
{
// When match_not_null is on, the regex engine should reject empty matches and
// move on to try other solutions.
std::cmatch m;
assert(!std::regex_search("a", m, std::regex("b*"),
std::regex_constants::match_not_null));
assert(std::regex_search("aa", m, std::regex("a*?"),
std::regex_constants::match_not_null));
assert(m[0].length() == 1);
assert(!std::regex_search("a", m, std::regex("b*", std::regex::extended),
std::regex_constants::match_not_null));
assert(!std::regex_search(
"a", m,
std::regex("b*", std::regex::extended | std::regex_constants::nosubs),
std::regex_constants::match_not_null));
assert(!std::regex_match("", m, std::regex("a*"),
std::regex_constants::match_not_null));
assert(!std::regex_match("", m, std::regex("a*", std::regex::extended),
std::regex_constants::match_not_null));
assert(!std::regex_match(
"", m,
std::regex("a*", std::regex::extended | std::regex_constants::nosubs),
std::regex_constants::match_not_null));
return 0;
}
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