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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::regex(R"(^[\w-a]$)") fails (std::regex(R"(^[-\wa]$)") succeeds)"
href="https://bugs.llvm.org/show_bug.cgi?id=39575">39575</a>
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<tr>
<th>Summary</th>
<td>std::regex(R"(^[\w-a]$)") fails (std::regex(R"(^[-\wa]$)") succeeds)
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>7.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nishida_kenji@nintendo.co.jp
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Code tested on <a href="https://wandbox.org/">https://wandbox.org/</a>
--------------------------
#include <iostream>
#include <regex>
int main() {
std::regex re;
try {
// std::regex(R"(^[-\wa]$)"), std::regex(R"(^[\w-]$)")
// are ok for libc++
re = std::regex(R"(^[\w-a]$)");
} catch ( const std::regex_error& err ) {
// 1:The expression contained an invalid collating element name.
std::cout << err.code() << ':' << err.what() << std::endl;
std::abort();
}
std::cout << std::regex_search(R"(-)", re) << std::endl;
}
--------------------------
This code throws the exception on clang 7.0.0(and 8.0.0).
It does not throw on gcc.</pre>
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