v class="spec value anchored" id="val-contains"><a href="#val-contains" class="anchor"></a><code><span><span class="keyword">val</span> contains : <span>string <span class="arrow">&#45;&gt;</span></span> <span>char <span class="arrow">&#45;&gt;</span></span> bool</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-sub"><a href="#val-sub" class="anchor"></a><code><span><span class="keyword">val</span> sub : <span>string <span class="arrow">&#45;&gt;</span></span> <span><s