85 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <regex>10 11// match_prev_avail:12// --first is a valid iterator position. When this flag is set the flags13// match_not_bol and match_not_bow shall be ignored by the regular14// expression algorithms (30.11) and iterators (30.12)15 16#include <regex>17 18#include <cassert>19#include <string>20 21int main(int, char**) {22 char str1[] = "\na";23 auto str1_scnd = str1 + 1;24 25 // Assert that match_prev_avail disables match_not_bol and this matches26 assert(std::regex_match(str1 + 1, str1 + 2, std::regex("^a"),27 std::regex_constants::match_not_bol |28 std::regex_constants::match_prev_avail));29 // Manually passing match_prev_avail defines that --str1 is a valid position30 assert(std::regex_match(str1_scnd, std::regex("a"),31 std::regex_constants::match_not_bol |32 std::regex_constants::match_prev_avail));33 34 //Assert that match_prev_avail disables match_not_bow and this matches35 assert(std::regex_search(str1, std::regex("\\ba")));36 assert(std::regex_match(str1 + 1, str1 + 2, std::regex("\\ba\\b"),37 std::regex_constants::match_not_bow |38 std::regex_constants::match_prev_avail));39 assert(std::regex_search(str1_scnd, std::regex("\\ba"),40 std::regex_constants::match_not_bow |41 std::regex_constants::match_prev_avail));42 43 //Assert that match_prev_avail disables both match_not_bow and match_not_bol44 assert(std::regex_match(str1 + 1, str1 + 2, std::regex("^a"),45 std::regex_constants::match_not_bol |46 std::regex_constants::match_not_bow |47 std::regex_constants::match_prev_avail));48 assert(std::regex_match(str1_scnd, std::regex("\\ba"),49 std::regex_constants::match_not_bol |50 std::regex_constants::match_not_bow |51 std::regex_constants::match_prev_avail));52 53 // pr 4219954 std::string S = " cd";55 std::string::iterator Start = S.begin() + 1;56 std::string::iterator End = S.end();57 assert(std::regex_search(Start, End, std::regex("^cd")));58 59 assert(!std::regex_search(Start, End, std::regex("^cd"),60 std::regex_constants::match_not_bol));61 assert(!std::regex_search(Start, End, std::regex(".*\\bcd\\b"),62 std::regex_constants::match_not_bow));63 assert(!std::regex_search(Start, End, std::regex("^cd"),64 std::regex_constants::match_not_bol |65 std::regex_constants::match_not_bow));66 assert(!std::regex_search(Start, End, std::regex(".*\\bcd\\b"),67 std::regex_constants::match_not_bol |68 std::regex_constants::match_not_bow));69 70 assert(std::regex_search(Start, End, std::regex("^cd"),71 std::regex_constants::match_prev_avail));72 73 assert(std::regex_search(Start, End, std::regex("^cd"),74 std::regex_constants::match_not_bol |75 std::regex_constants::match_prev_avail));76 assert(std::regex_search(Start, End, std::regex("^cd"),77 std::regex_constants::match_not_bow |78 std::regex_constants::match_prev_avail));79 assert(std::regex_match(Start, End, std::regex("\\bcd\\b"),80 std::regex_constants::match_not_bol |81 std::regex_constants::match_not_bow |82 std::regex_constants::match_prev_avail));83 return 0;84}85