r">positions</span></code> and is the <code class="computeroutput"><span class="identifier">position_cache</span></code>, <code class="computeroutput"><span class="identifier">position_of</span></code>
        returns an iterator range that points to the start and end (<code class="computeroutput"><span class="identifier">pos</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()</span></code> and <code class="computeroutput"><span class="identifier">pos</span><spa