Usually we don't write full-blown scripts if the Seeker of Perl Wisdom doesn't post any example code, but I put something together here that should get you started.

I'm not sure if glob would be faster, as I did not test it, so you can play around.

This code looks at all files located in the directory specified as the second argument to find() (recursively). If it's a file, it opens it, reads it line by line, and if it has the keyword (HELLO) at the start of line, it checks the line fields 1, 3 and 4 (after being split() on a forward slash) to ensure they are not empty. If the file contains a line starting with 'HELLO' but has at least one line without all the fields with data, it'll log to a file and continue on.

You'll need to research how to print the directory path with the file in the log (if you need it), sort out your indexing, replace your keyword etc

#!/usr/bin/perl

use warnings;
use strict;

use File::Find;

open my $log, '>', 'log.txt'
  or die "Can't open the log file!: $!";

find(\&check_data, "./test");

sub check_data {
    
    my $file = $_; #for clarity

    return if ! -f $file;

    open my $fh, '<', $file
      or die "Can't open file $file: $!";

    for my $line (<$fh>){
        if ($line =~ /^HELLO/){
            my @parts = split(/\//, $line);
            for my $index (qw(1 3 4)){
                if (! $parts[$index] or $parts[$index] =~ /[\s+-]/){
                    print $log "$file is missing data.\n";
                    return
                }
            }
        }
    }
}
[download]

Example files:

$ cat test/hello.pl
adsfasdfasdf
HELLO/asdf/asdf/asdf/asdf/asdf

$ cat test/testing.txt 
asdfasdf/dfasdf/12351234132r
HELLO/asdf//////////
[download]

Output:

$ cat log.txt 
testing.txt is missing data.
[download]

-stevieb

EDIT: Added check for hyphen in line elems

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