C'est la vie. Blame it on the fact that we
      must work with the syntax rules of C++.
  </p>
    <p>
      Any expression that evaluates to a parser may be used with the Kleene
      Star. Keep in mind, though, that due to C++ operator precedence rules you
      may need to put the expression 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>
    <h3>
      <b><a name="list_of_numbers"></a> Example #4 [ A