open $HTML, '+<',...
print $HTML $line;

You can't edit an existing file like that, use separate file handles for read/write 

#!perl
use strict;
use warnings;

my $libFile = 'testfile';
my $filename = $libFile.'.html';
my $remove   = '<div><div class="blue"><\/div><\/div>';

open my $in, '<', $filename or die "Failed to read '$filename': $!";
my @array = <$in>;
close $in;
    
my $matchspotter = 0;    
for ( @array ) {
  if ( s/$remove//g ) {
    ++$matchspotter;
  }
}
print "\n$matchspotter lines replaced";

$filename  = $libFile.'_chg.html';
open my $out, '>', $filename or die "Failed to write '$filename': $!";
print $out $_ for @array;
close $out;

[download]
poj

In reply to Re: Strip specific html sequence by poj
in thread Strip specific html sequence by koober

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
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  • See Writeup Formatting Tips and other pages linked from there for more info.