ing.html#VALrindex_from_opt"><code class="code"><span class="constructor">String</span>.rindex_from_opt</code></a><code class="code">&nbsp;s&nbsp;(length&nbsp;s&nbsp;-&nbsp;1)&nbsp;c</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.05</li>
</ul>
</div>
<h2 id="1_StringsandSequences">Strings and Sequences</h2>
<pre><span id="VALto_seq"><span class="keyword">val</span> to_seq</span> : <code class="type"><a href="StringLabels.html#TYPEt">t</a> -&gt; char <a href="Seq.html#TYPEt">Seq.t</a></co