r">expect</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span>
</pre>
<p>
            Parser expression:
          </p>
<pre class="programlisting"><span class="identifier">expect</span><span class="special">[</span><span class="identifier">a</span> <span class="special">&gt;&gt;</span> <span class="identifier">b</span> <span class="special">&gt;&gt;</span> <span class="special">...]</span>
</pre>
<p>
            In the latter case while the plain <a class="lin