use strict;
my $str = '<h1>This is heading 1</h1>
<h2 style="color: aqua">This is heading 2</h2>
<h3>This is heading 3</h3>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
<a href="https://www.w3schools.com">This is a link</a>
<ul>
<li>Coffee</li>
<li>Tea</li>
<li>Milk</li>
</ul>';
my $regex = qr~\h*<(?!(?:h3|ul|p)\b)([^>]+).*?>[\w\W]*?</\1>\s*~mp;
my $subst = '';
my $result = $str =~ s~$regex~$subst~rg;
print "The result of the substitution is' $result\n";
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html