ass="identifier">a</span>
</pre>
<p>
        is similar to Kleene star. Rather than match everything, <code class="computeroutput"><span class="special">+</span><span class="identifier">a</span></code> matches one or more. Like it's related
        function, the Kleene star, its attribute is a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">A</span><span class="speci