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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 <cassert>
#include <regex>
using namespace std;
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(regex_match(str1 + 1, str1 + 2, regex("^a"),
regex_constants::match_not_bol |
regex_constants::match_prev_avail));
// Manually passing match_prev_avail defines that --str1 is a valid position
assert(regex_match(str1_scnd, regex("a"),
regex_constants::match_not_bol |
regex_constants::match_prev_avail));
//Assert that match_prev_avail disables match_not_bow and this matches
assert(regex_search(str1, regex("\\ba")));
assert(regex_match(str1 + 1, str1 + 2, regex("\\ba\\b"),
regex_constants::match_not_bow |
regex_constants::match_prev_avail));
assert(regex_search(str1_scnd, regex("\\ba"),
regex_constants::match_not_bow |
regex_constants::match_prev_avail));
//Assert that match_prev_avail disables both match_not_bow and match_not_bol
assert(regex_match(str1 + 1, str1 + 2, regex("^a"),
regex_constants::match_not_bol |
regex_constants::match_not_bow |
regex_constants::match_prev_avail));
assert(regex_match(str1_scnd, regex("\\ba"),
regex_constants::match_not_bol |
regex_constants::match_not_bow |
regex_constants::match_prev_avail));
// pr 42199
string S = " cd";
string::iterator Start = S.begin() + 1;
string::iterator End = S.end();
assert(regex_search(Start, End, regex("^cd")));
assert(
!regex_search(Start, End, regex("^cd"), regex_constants::match_not_bol));
assert(!regex_search(Start, End, regex(".*\\bcd\\b"),
regex_constants::match_not_bow));
assert(!regex_search(Start, End, regex("^cd"),
regex_constants::match_not_bol |
regex_constants::match_not_bow));
assert(!regex_search(Start, End, regex(".*\\bcd\\b"),
regex_constants::match_not_bol |
regex_constants::match_not_bow));
assert(regex_search(Start, End, regex("^cd"),
regex_constants::match_prev_avail));
assert(regex_search(Start, End, regex("^cd"),
regex_constants::match_not_bol |
regex_constants::match_prev_avail));
assert(regex_search(Start, End, regex("^cd"),
regex_constants::match_not_bow |
regex_constants::match_prev_avail));
assert(regex_match(Start, End, regex("\\bcd\\b"),
regex_constants::match_not_bol |
regex_constants::match_not_bow |
regex_constants::match_prev_avail));
return 0;
}
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