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// <regex>
11
12// template <class charT, class traits = regex_traits<charT>> class basic_regex;
13
14// template <class ST, class SA>
15//    basic_regex(const basic_string<charT, ST, SA>& s);
16
17#include <regex>
18#include <cassert>
19
20static bool error_escape_thrown(const char *pat)
21{
22    bool result = false;
23    try {
24        std::regex re(pat);
25    } catch (std::regex_error &ex) {
26        result = (ex.code() == std::regex_constants::error_escape);
27    }
28    return result;
29}
30
31int main()
32{
33    assert(error_escape_thrown("[\\a]"));
34    assert(error_escape_thrown("\\a"));
35
36    assert(error_escape_thrown("[\\e]"));
37    assert(error_escape_thrown("\\e"));
38
39    assert(error_escape_thrown("[\\c:]"));
40    assert(error_escape_thrown("\\c:"));
41    assert(error_escape_thrown("\\c"));
42    assert(!error_escape_thrown("[\\cA]"));
43    assert(!error_escape_thrown("\\cA"));
44
45}
46