he result is unspecified.</p></div></div><div class="platform platform-haxe-ui-toolkit"><a name="matchSub"></a><h3 style="line-height: 15px;"><p><code style="margin-left: -5px;"><span class="keyword">function</span> <a href="#matchSub"><span class="identifier">matchSub</span></a>(s:<a class="type" href="./String.html">String</a>, pos:<a class="type" href="./Int.html">Int</a>, ?len:<a class="type" href="./Int.html">Int</a> = -1):<a class="type" href="./Bool.html">Bool</a></code></p></h3><div class="doc" styl