1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // <regex>
10
11 // match_not_null:
12 // The regular expression shall not match an empty sequence.
13
14 #include "test_macros.h"
15 #include <cassert>
16 #include <regex>
17
main(int,char **)18 int main(int, char**)
19 {
20 // When match_not_null is on, the regex engine should reject empty matches and
21 // move on to try other solutions.
22 std::cmatch m;
23 assert(!std::regex_search("a", m, std::regex("b*"),
24 std::regex_constants::match_not_null));
25 assert(std::regex_search("aa", m, std::regex("a*?"),
26 std::regex_constants::match_not_null));
27 assert(m[0].length() == 1);
28 assert(!std::regex_search("a", m, std::regex("b*", std::regex::extended),
29 std::regex_constants::match_not_null));
30 assert(!std::regex_search(
31 "a", m,
32 std::regex("b*", std::regex::extended | std::regex_constants::nosubs),
33 std::regex_constants::match_not_null));
34
35 assert(!std::regex_match("", m, std::regex("a*"),
36 std::regex_constants::match_not_null));
37 assert(!std::regex_match("", m, std::regex("a*", std::regex::extended),
38 std::regex_constants::match_not_null));
39 assert(!std::regex_match(
40 "", m,
41 std::regex("a*", std::regex::extended | std::regex_constants::nosubs),
42 std::regex_constants::match_not_null));
43
44 return 0;
45 }
46