ut&gt;</span></code> arguments are concatenated before matching.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">&lt;replacement_expression&gt;</span></code> may refer to parenthesis-delimited
subexpressions of the match using <code class="docutils literal notranslate"><span class="pre">\1</span></code>, <code class="docutils literal notranslate"><span class="pre">\2</span></code>, ..., <code class="docutils literal notranslate"><span class="pre">\9</span></code>.  Note that
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