| //===----------------------------------------------------------------------===// |
| // |
| // 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; |
| } |