t_variable&gt;</span></code> a substring of a given <code class="docutils literal notranslate"><span class="pre">&lt;string&gt;</span></code>.  If
<code class="docutils literal notranslate"><span class="pre">&lt;length&gt;</span></code> is <code class="docutils literal notranslate"><span class="pre">-1</span></code> the remainder of the string starting at <code class="docutils literal notranslate"><span class="pre">&lt;begin&gt;</span></code>
will be returned.</p>
<div class="versionchanged">
<p><span class