Sorry about that, let me see if I can paste a working portion in here

#!/usr/bin/perl

use 5.010;
use Time::Local;

my $file_01_txt = "file_01.txt";

($sec, $min, $hour, $mday, $mon, $year, $j1,$j2, $j3) =localtime(time)
+;

$year = $year+1900;
$mon = $mon+1;
$outfolder = "REPORT_output\_$year\_$mon\_$mday\_\_$hour\_$min\_$sec";

mkdir $outfolder;
mkdir "$outfolder/log";

$html_file = <$outfolder/REPORT.html>;
$log_file = <$outfolder/log/log.txt>;

open($html_report, '>', $html_file) or die "Cannot open file $html_fil
+e";
open($log_report, '>', $log_file) or die "Cannot open file $log_file";

main();

sub main {
    if (-e $file_01_txt) {
        # We are going to open the log file for appending.
        open($log_report, '>>', $log_file) or die "Cannot open $log_fi
+le.";
    
        # We are going to open the HTML file for appending.
        open($html_report, '>>', $html_file) or die "Cannot open file 
+$html_file";    
    
        # If the file exists, we are going to open it, so we can read 
+from it.        
        print $log_report "$file_01_txt has been found.\n";
        open (my $fh, "<", $file_01_txt) or die "Cannot open file $fil
+e_01_txt";
        
        print $html_report "\n";
        print $html_report "#### Now Analyzing '$file_01_txt'\n";
        print $html_report "\n";
        while (my $line = <$fh>) {
            chomp $line;
            if ($line =~ /search criteria 01/i) {
                print $html_report "$line\n";
            }
            if ($line =~ /search criteria 02/i) {
                print $html_report "$line\n";
            }
            if ($line =~ /search criteria 03/i) {
                print $html_report "$line\n";
                print $html_report "\n";
            }
        }
        close $log_report;
        close $html_report;
    } else {
        # We are going to open the log file for appending.
        open($log_report, '>>', $log_file) or die "Cannot open $log_fi
+le.";
        
        # We are going to log that the file has not been found.
        print $log_report "$file_01_txt has not been found.\n";
        
        close $log_report;
    }
}
[download]

That should work. I just ran it and everything came back as it should.

Please let me know if I need to give you anything else!