match_not_null.pass.cpp (1688B)
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 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 }