<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/60073>60073</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            LLVM regex backreference support broken
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    `llvm::Regex` fails to match `(foo|bar)_\1` against `foo_foo`.
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJxEkD2T3CAMhn-NaJjzYGFgXVBcLuPq0qRIeyMwtsmyZgdwPv59xk5xlQq90jzvQ7XGdQ_BgvoC6iujo2252D3eo2cuz38taJHSrwfIV5Cv38Ma_oAWfKGYKm-ZP6j5jYMWgLclZzBvjgrg-AHqrT-TtFLcazsjS84fZ0aLjs1WzqMciQXbayNvt0GjZJvtnTQjDbgIMd-UnIfRjL43mojc3Cti0aJAKfpe90oZIbvBD6jNMihFNKLxMIjwoJi6E7vLZWWx1iNYLYSRLJELqV51Effwm19LQDzbF3vevLhjrTCIFGurn19abCnY9_cf33g5NXBH_l7CEkrYfeD1eD5zadyVfA87O0qyW2vPeorDCXBaY9sO1_n8AJwupf_Hy7Pkn8E3wOliqYDTxfovAAD__5UpgJY">