<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Type of regular expression in clang-format is not documented"
   href="https://bugs.llvm.org/show_bug.cgi?id=35041">35041</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Type of regular expression in clang-format is not documented
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </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>Documentation
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>wim.leflere@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>clang-format uses regular expressions to give priorities when sorting includes.
It uses 'POSIX extended regular expressions' for this. But this is missing from
the documentation.

I found out because '\w' to match word characters doesn't work. You have to use
[[:alnum:]].

The documentation could link to <a href="https://man.openbsd.org/re_format.7">https://man.openbsd.org/re_format.7</a></pre>
        </div>
      </p>


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