Hex string search all files in directory

[starface245]

In my folder I have 8 text files and each of those files I want to do hex string search of "hello"
In my folder:
test.txt
test1.txt
foo2.txt
boo3.txt
bar4.txt
fish5.txt
cat6.txt
dog7.txt
I would the output
test.txt match
test1.txt match
foo2.txt not match
boo3.txt match
bar4.txt match
fish5.txt not match
cat6.txt notmatch
dog7.txt match
So far, it only does output = "test.txt match" no other ouputs.

#!/usr/bin/perl
use strict;

my @files =glob ("*.txt");
my $hex_out = "hex.txt";


for my $file(@files) {

open (HEX_IN, "$file") or die;
open (HEX_OUT, ">$hex_out") or die;

binmode(HEX_IN);
binmode(HEX_OUT);

local $/;
my $hex_string = <HEX_IN>;

 if ($hex_string =~ /\hello/)
    {    
    print HEX_OUT "$file";
    print HEX_OUT " match";
    }
 else
    {
    print HEX_OUT "$file";
    print HEX_OUT " not match";
    }
}

close(HEX_IN);
close(HEX_OUT);

It has to be in hex string format. Thanks!