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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - No exception is thrown when an invalid character range (e.g., [b-a]) is included."
href="https://bugs.llvm.org/show_bug.cgi?id=51686">51686</a>
</td>
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<th>Summary</th>
<td>No exception is thrown when an invalid character range (e.g., [b-a]) is included.
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>12.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Standards Issues
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>w.kensuke@fujitsu.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>---
#include <regex>
#include <cassert>
#include <cstdio>
static bool error_range_thrown(const char *pat)
{
bool result = false;
try {
std::regex re(pat);
} catch (const std::regex_error &ex) {
puts("regex_error");
fflush(stdout);
result = (ex.code() == std::regex_constants::error_range);
}
return result;
}
int main(int, char**)
{
assert(error_range_thrown("([b-a])"));
}
---
This program is created using the regular expression sample described in the
C++ language standard, but it did not throw an exception (as expected).
(e.g., Table 132 in
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4713.pdf">http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4713.pdf</a>)
I've confirmed that this problem can be reproduced using clang 13.0.0 "[C++]
clang HEAD 13.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
c4ed142e695f14ba5675ec6d12226ee706329a0f)" on Wandbox (<a href="https://wandbox.org/">https://wandbox.org/</a>).
This code throws the exception on gcc-10.1.0 (or other gcc version).</pre>
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