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#!/usr/bin/perl
use strict;
...
# display updated DOM 
say $dom;

<h2 class="Match Literal Text">2.1. Match Literal Text</h2>
<h2 class="Match Nonprintable Characters">2.2. Match Nonprintable Char
+acters</h2>
<h2 class="Match One of Many Characters">2.3. Match One of Many Charac
+ters</h2>