ax rules of C++.
        </p>
<p>
          Any expression that evaluates to a parser may be used with the Kleene Star.
          Keep in mind that C++ operator precedence rules may require you to put
          expressions in parentheses for complex expressions. The Kleene Star is
          also known as a Kleene Closure, but we call it the Star in most places.
        </p>
<h6>
<a name="spirit.qi.tutorials.warming_up.h3"></a>
          <span class="phrase"><a name="spirit.qi.tutorials.warming_up.trivial_ex