which are not normally
        allowed inside character sets), for example <code class="computeroutput"><span class="special">[[.^.]</span><span class="identifier">abc</span><span class="special">]</span></code> would
        match either one of the characters 'abc^'.
      </p>
<p>
        As an extension, a collating element may also be specified via its <a class="link" href="collating_names.html" title="Collating Names">symbolic name</a>, for example:
      </p>
<pre class="programlisting"><span class="s