Escape HTML tags:
<?_eh In structural HTML, the <b> tag should be replaced with <strong> and the
<i> tag with <em>. _eh?>

Escape a code example:
<pre><code><?_eh
# Overload Apache::FakeRequest's print to append output to a variable.
{
	no warnings 'redefine';
	*Apache::FakeRequest::print = sub {
		my $r = shift;
		$Output .= join('', @_)
	};
	*Apache::FakeRequest::log_error = sub {
		my $r - shift;
		print STDERR @_, "\n"; $Errout .= join('', @_)
	};
	*Apache::FakeRequest::pnotes = sub {
		my ( $r, $key ) = @_;
		$Pnotes->{ $key } = shift if @_;
		$Pnotes->{ $key };
	};
}
_eh?></code></pre>