1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <regex>
11
12 // match_not_null:
13 // The regular expression shall not match an empty sequence.
14
15 #include "test_macros.h"
16 #include <cassert>
17 #include <regex>
18
main()19 int main()
20 {
21 // When match_not_null is on, the regex engine should reject empty matches and
22 // move on to try other solutions.
23 std::cmatch m;
24 assert(!std::regex_search("a", m, std::regex("b*"),
25 std::regex_constants::match_not_null));
26 assert(std::regex_search("aa", m, std::regex("a*?"),
27 std::regex_constants::match_not_null));
28 assert(m[0].length() == 1);
29 assert(!std::regex_search("a", m, std::regex("b*", std::regex::extended),
30 std::regex_constants::match_not_null));
31 assert(!std::regex_search(
32 "a", m,
33 std::regex("b*", std::regex::extended | std::regex_constants::nosubs),
34 std::regex_constants::match_not_null));
35
36 assert(!std::regex_match("", m, std::regex("a*"),
37 std::regex_constants::match_not_null));
38 assert(!std::regex_match("", m, std::regex("a*", std::regex::extended),
39 std::regex_constants::match_not_null));
40 assert(!std::regex_match(
41 "", m,
42 std::regex("a*", std::regex::extended | std::regex_constants::nosubs),
43 std::regex_constants::match_not_null));
44
45 return 0;
46 }
47