my code is,

<ul>
       <li class="orangeTxt1"><a name="a3" id="a3">question-1</a></li>
       <li>Answer1</li>
</ul>
<ul>
       <li class="orangeTxt1"><a name="a4" id="a4">question-2</a></li>
       <li>Answer2</li>

</ul>
[download]

I need output of the form,

<ul>
       <li class="orangeTxt1"><a name="a3" id="a3">question-1</a></li>
       <li>Answer1</li>
       <span class="backTotop"> <a href="#a4">Back to top</a></span>
  <div class="border"> </div>
</ul>
<ul>
       <li class="orangeTxt1"><a name="a4" id="a4">question-2</a></li>
       <li>Answer2</li>
       <span class="backTotop"> <a href="#a4">Back to top</a></span>
  <div class="border"> </div>

</ul>
[download]

The logic i used using regular expression is,

use strict;
use warnings;

my $data = do {local $/; <DATA>};

my $tag = 'ul';

my $count = () = $data =~ /<\Q$tag\E(?:\s.*?)?>/g;

print "Total number of $tag tags are: " . $count . "\n";


my @tags_to_insert = qq{
  <span class="backTotop"> <a href="#a2">Back to top</a></span>
  <div class="borderGoal"> </div>
                       };
my $insert=~s (<\Q$tag\E(?:\s.*?)?)(\@tags_to_insert\E)gs;

__DATA__

Data goes here...
[download]

i get error message when i execute. kindly help me out.

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