I was trying to understand your code and I just got lost!
Can you provide just 2 input files and desired output?

Here is where I got to before being completely lost.

#!/usr/bin/perl 
use strict;     # turned on strict and warnings.
use warnings;   # a "#" in front makes them comments

my $DFile="/home/infosec/data/RegEx";
open (DATAF, "<$DFile") || die ("Cannot open DATAF file \n");

# don't use DATA as a file handle, that is a reserved word for Perl.
# no need to "eval" $regex

foreach my $line (<DATAF>) 
{
    chomp $line;
    my ($tname, tvalu, $tfile, $regex) = split(/:/, $line);
  
    open (TFILE, "<$tname") || die ("Cannot open Test file $tname\n");
    while (<TFILE>)
    {
       next unless /$regex/;
       print $_;  

       # this is so obtuse that my brain hurts!
       # These super tricky Perl Special Variables like
       # $&  $- $+ are EXTREMELY seldom needed. Get rid of them.
       # please explain what this is supposed to do....
       # $- is a scalar, not an array, what do you intend by $-[0]?
       #
       # print "\t\t\$&: ",
       #     substr( $_, $-[0], $+[0] - $-[0] ),
       #     "\n";

       # foreach my $i ( 1 .. $#- )
       # {
       #     print "\t\t\$$i: ",
       #         substr( $_, $-[$i], $+[$i] - $-[$i] ),
       #         "\n";
       #  }

    }
    print "\n";
}
print "\n";
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