de">s</code> after
    position <code class="code">start</code>.  <code class="code">contains&nbsp;s&nbsp;c</code> is equivalent to <code class="code">contains_from<br>
&nbsp;&nbsp;&nbsp;&nbsp;s&nbsp;0&nbsp;c</code>.</p>

<p>Raise <code class="code"><span class="constructor">Invalid_argument</span></code> if <code class="code">start</code> is not a valid position in <code class="code">s</code>.</p>
</div>
</div>

<pre><span id="VALrcontains_from"><span class="keyword">val</span> rcontains_from</span> : <cod