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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_prev_avail:
// --first is a valid iterator position. When this flag is set the flags
// match_not_bol and match_not_bow shall be ignored by the regular
// expression algorithms (30.11) and iterators (30.12)
#include <regex>
#include <cassert>
#include <string>
int main(int, char**) {
char str1[] = "\na";
auto str1_scnd = str1 + 1;
// Assert that match_prev_avail disables match_not_bol and this matches
assert(std::regex_match(str1 + 1, str1 + 2, std::regex("^a"),
std::regex_constants::match_not_bol |
std::regex_constants::match_prev_avail));
// Manually passing match_prev_avail defines that --str1 is a valid position
assert(std::regex_match(str1_scnd, std::regex("a"),
std::regex_constants::match_not_bol |
std::regex_constants::match_prev_avail));
//Assert that match_prev_avail disables match_not_bow and this matches
assert(std::regex_search(str1, std::regex("\\ba")));
assert(std::regex_match(str1 + 1, str1 + 2, std::regex("\\ba\\b"),
std::regex_constants::match_not_bow |
std::regex_constants::match_prev_avail));
assert(std::regex_search(str1_scnd, std::regex("\\ba"),
std::regex_constants::match_not_bow |
std::regex_constants::match_prev_avail));
//Assert that match_prev_avail disables both match_not_bow and match_not_bol
assert(std::regex_match(str1 + 1, str1 + 2, std::regex("^a"),
std::regex_constants::match_not_bol |
std::regex_constants::match_not_bow |
std::regex_constants::match_prev_avail));
assert(std::regex_match(str1_scnd, std::regex("\\ba"),
std::regex_constants::match_not_bol |
std::regex_constants::match_not_bow |
std::regex_constants::match_prev_avail));
// pr 42199
std::string S = " cd";
std::string::iterator Start = S.begin() + 1;
std::string::iterator End = S.end();
assert(std::regex_search(Start, End, std::regex("^cd")));
assert(!std::regex_search(Start, End, std::regex("^cd"),
std::regex_constants::match_not_bol));
assert(!std::regex_search(Start, End, std::regex(".*\\bcd\\b"),
std::regex_constants::match_not_bow));
assert(!std::regex_search(Start, End, std::regex("^cd"),
std::regex_constants::match_not_bol |
std::regex_constants::match_not_bow));
assert(!std::regex_search(Start, End, std::regex(".*\\bcd\\b"),
std::regex_constants::match_not_bol |
std::regex_constants::match_not_bow));
assert(std::regex_search(Start, End, std::regex("^cd"),
std::regex_constants::match_prev_avail));
assert(std::regex_search(Start, End, std::regex("^cd"),
std::regex_constants::match_not_bol |
std::regex_constants::match_prev_avail));
assert(std::regex_search(Start, End, std::regex("^cd"),
std::regex_constants::match_not_bow |
std::regex_constants::match_prev_avail));
assert(std::regex_match(Start, End, std::regex("\\bcd\\b"),
std::regex_constants::match_not_bol |
std::regex_constants::match_not_bow |
std::regex_constants::match_prev_avail));
return 0;
}
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