ss="special">(</span><span class="string">"a-zA-Z_0-9"</span><span class="special">)</span></code>) as a separate parser construct. The following
          code snippet illustrates the idea (for the full code of this example please
          see <a href="../../../../../test/qi/distinct.cpp" target="_top">distinct.cpp</a>):
        </p>
<p>
</p>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">spirit</span> <span class="special">=</span> <span class="identifier">boo