s="identifier">_r1</span><span class="special">)</span>
    <span class="special">&gt;</span>   <span class="char">'&gt;'</span>
<span class="special">;</span>
</pre>
<p>
          What is it? It's the <span class="emphasis"><em>expectation</em></span> operator. You will
          have some "deterministic points" in the grammar. Those are the
          places where backtracking <span class="bold"><strong>cannot</strong></span> occur.
          For our example above, when you get a <code class="computeroutpu