The complex parser presented above reads as:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              One or two real numbers in parentheses, separated by comma (the second
              number is optional)
            </li>
<li class="listitem">
              <span class="bold"><strong>OR</strong></span> a single real number.
            </li>
</ul></div>
<p>
          This parser can parse complex numbers of the form:
        </p>