85 lines
3.7 KiB
C++
85 lines
3.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <regex>
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// match_prev_avail:
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// --first is a valid iterator position. When this flag is set the flags
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// match_not_bol and match_not_bow shall be ignored by the regular
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// expression algorithms (30.11) and iterators (30.12)
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#include <regex>
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#include <cassert>
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#include <string>
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int main(int, char**) {
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char str1[] = "\na";
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auto str1_scnd = str1 + 1;
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// Assert that match_prev_avail disables match_not_bol and this matches
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assert(std::regex_match(str1 + 1, str1 + 2, std::regex("^a"),
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std::regex_constants::match_not_bol |
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std::regex_constants::match_prev_avail));
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// Manually passing match_prev_avail defines that --str1 is a valid position
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assert(std::regex_match(str1_scnd, std::regex("a"),
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std::regex_constants::match_not_bol |
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std::regex_constants::match_prev_avail));
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//Assert that match_prev_avail disables match_not_bow and this matches
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assert(std::regex_search(str1, std::regex("\\ba")));
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assert(std::regex_match(str1 + 1, str1 + 2, std::regex("\\ba\\b"),
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std::regex_constants::match_not_bow |
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std::regex_constants::match_prev_avail));
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assert(std::regex_search(str1_scnd, std::regex("\\ba"),
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std::regex_constants::match_not_bow |
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std::regex_constants::match_prev_avail));
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//Assert that match_prev_avail disables both match_not_bow and match_not_bol
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assert(std::regex_match(str1 + 1, str1 + 2, std::regex("^a"),
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std::regex_constants::match_not_bol |
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std::regex_constants::match_not_bow |
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std::regex_constants::match_prev_avail));
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assert(std::regex_match(str1_scnd, std::regex("\\ba"),
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std::regex_constants::match_not_bol |
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std::regex_constants::match_not_bow |
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std::regex_constants::match_prev_avail));
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// pr 42199
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std::string S = " cd";
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std::string::iterator Start = S.begin() + 1;
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std::string::iterator End = S.end();
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assert(std::regex_search(Start, End, std::regex("^cd")));
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assert(!std::regex_search(Start, End, std::regex("^cd"),
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std::regex_constants::match_not_bol));
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assert(!std::regex_search(Start, End, std::regex(".*\\bcd\\b"),
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std::regex_constants::match_not_bow));
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assert(!std::regex_search(Start, End, std::regex("^cd"),
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std::regex_constants::match_not_bol |
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std::regex_constants::match_not_bow));
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assert(!std::regex_search(Start, End, std::regex(".*\\bcd\\b"),
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std::regex_constants::match_not_bol |
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std::regex_constants::match_not_bow));
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assert(std::regex_search(Start, End, std::regex("^cd"),
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std::regex_constants::match_prev_avail));
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assert(std::regex_search(Start, End, std::regex("^cd"),
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std::regex_constants::match_not_bol |
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std::regex_constants::match_prev_avail));
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assert(std::regex_search(Start, End, std::regex("^cd"),
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std::regex_constants::match_not_bow |
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std::regex_constants::match_prev_avail));
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assert(std::regex_match(Start, End, std::regex("\\bcd\\b"),
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std::regex_constants::match_not_bol |
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std::regex_constants::match_not_bow |
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std::regex_constants::match_prev_avail));
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return 0;
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}
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