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-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <regex>
10
11// Test that replacing zero-length matches works correctly.
12
13#include <cassert>
14#include <regex>
15#include <string>
16#include "test_macros.h"
17
18int main(int, char**) {
19 // Various patterns that produce zero-length matches.
20 assert(std::regex_replace("abc", std::regex(""), "!") == "!a!b!c!");
21 assert(std::regex_replace("abc", std::regex("X*"), "!") == "!a!b!c!");
22 assert(std::regex_replace("abc", std::regex("X{0,3}"), "!") == "!a!b!c!");
23
24 // Replacement string has several characters.
25 assert(std::regex_replace("abc", std::regex(""), "[!]") == "[!]a[!]b[!]c[!]");
26
27 // Empty replacement string.
28 assert(std::regex_replace("abc", std::regex(""), "") == "abc");
29
30 // Empty input.
31 assert(std::regex_replace("", std::regex(""), "!") == "!");
32
33 // Not all matches are zero-length.
34 assert(std::regex_replace("abCabCa", std::regex("C*"), "!") == "!a!b!!a!b!!a!");
35
36 return 0;
37}
38

source code of libcxx/test/std/re/re.alg/re.alg.replace/zero_length_matches.pass.cpp