<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/119432>119432</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc++] Wrong match results for POSIX basic regular expression `[]-_]`
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          muellerj2
      </td>
    </tr>
</table>

<pre>
    The basic regular expression `[]-_]` should match all characters in the character range `]-_` (i.e., `]`, `^` and `_`). But libc++ erroneously does not treat `]-_` as a character range and instead matches `]`, `-` and `_`.

Godbolt: https://godbolt.org/z/4WE8PdGPE
</pre>
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