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46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <regex>
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// match_not_null:
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// The regular expression shall not match an empty sequence.
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#include "test_macros.h"
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#include <cassert>
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#include <regex>
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int main(int, char**)
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{
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// When match_not_null is on, the regex engine should reject empty matches and
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// move on to try other solutions.
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std::cmatch m;
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assert(!std::regex_search("a", m, std::regex("b*"),
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std::regex_constants::match_not_null));
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assert(std::regex_search("aa", m, std::regex("a*?"),
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std::regex_constants::match_not_null));
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assert(m[0].length() == 1);
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assert(!std::regex_search("a", m, std::regex("b*", std::regex::extended),
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std::regex_constants::match_not_null));
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assert(!std::regex_search(
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"a", m,
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std::regex("b*", std::regex::extended | std::regex_constants::nosubs),
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std::regex_constants::match_not_null));
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assert(!std::regex_match("", m, std::regex("a*"),
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std::regex_constants::match_not_null));
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assert(!std::regex_match("", m, std::regex("a*", std::regex::extended),
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std::regex_constants::match_not_null));
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assert(!std::regex_match(
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"", m,
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std::regex("a*", std::regex::extended | std::regex_constants::nosubs),
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std::regex_constants::match_not_null));
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return 0;
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}
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