If you'd like to avoid printing lines 16-25, it could be as simple as:
perl -i.bak -ne 'print unless 16 .. 25' *.html

[download]

However, if you wish to parse out specific <div> section(s), it is best to use a well-tested module:
use XML::Twig;

my $twig = XML::Twig->new(
    twig_handlers => {
        div => sub { 
            my $class = $_->att("class") // "";
            $_->delete if $class eq "topsearchbar";
        },
    }
);

$twig->parse_html(\*DATA)->print;

__END__
Each of the unwanted divs at this point
<div>starts</div>
with
  <div class="topsearchbar">
    and <div>ends</div> with
  </div>. 
They are on lines 16-25 of the file.

[download]

Output:
<html><head></head><body>Each of the unwanted divs at this point
<div>starts</div>
with
  . 
They are on lines 16-25 of the file.
</body></html>

[download]

In reply to Re: Delete multiple lines of text from a file? by repellent
in thread Delete multiple lines of text from a file? by Erika

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