><a name="spirit.qi.reference.auxiliary.eps.simple_form"></a></span><a class="link" href="eps.html#spirit.qi.reference.auxiliary.eps.simple_form">Simple
            Form</a>
          </h6>
<p>
            In its simplest form, <code class="computeroutput"><span class="identifier">eps</span></code>
            matches the null string and always returns a match of zero length:
          </p>
<pre class="programlisting"><span class="identifier">eps</span> <span class="comment">// always returns a zero-length 