re are the syntax diagrams:
      </p>
<div class="blockquote"><blockquote class="blockquote"><p>
          <span class="inlinemediaobject"><img src="../.././images/kleene.png" alt="kleene"></span>
        </p></blockquote></div>
<div class="blockquote"><blockquote class="blockquote"><p>
          <span class="inlinemediaobject"><img src="../.././images/plus.png" alt="plus"></span>
        </p></blockquote></div>
<p>
        The first, called the Kleene star, matches zero or more of its subject <code class=