1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// UNSUPPORTED: libcpp-no-exceptions
11// <regex>
12
13// template <class charT, class traits = regex_traits<charT>> class basic_regex;
14
15// template <class ST, class SA>
16//    basic_regex(const basic_string<charT, ST, SA>& s);
17
18#include <regex>
19#include <cassert>
20#include "test_macros.h"
21
22static bool error_badbackref_thrown(const char *pat)
23{
24    bool result = false;
25    try {
26        std::regex re(pat);
27    } catch (const std::regex_error &ex) {
28        result = (ex.code() == std::regex_constants::error_backref);
29    }
30    return result;
31}
32
33int main()
34{
35    assert(error_badbackref_thrown("\\1abc"));      // no references
36    assert(error_badbackref_thrown("ab(c)\\2def")); // only one reference
37
38//  this should NOT throw, because we only should look at the '1'
39//  See https://bugs.llvm.org/show_bug.cgi?id=31387
40    {
41    const char *pat1 = "a(b)c\\1234";
42    std::regex re(pat1, pat1 + 7); // extra chars after the end.
43    }
44}
45