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#!/usr/bin/env perl

...
}

say for @html;

<h2 id="match_literal_text">2.1. Match Literal Text</h2>
<h3 id="h3_heading">2.1.1 H3 Heading</h3>
<h4 id="h4_heading">2.1.1.1 H4 Heading</h4>
<h2 id="match_nonprintable_characters">2.2. Match Nonprintable Charact
+ers</h2>
<h2 id="match_one_of_many_characters">2.3. Match One of Many Character
+s</h2>