Hi Vikasdawar,
Please for you open function check if it works or display an error message or you use autodie qw(open close)
Please, try the following below: 

#!/usr/bin/perl
use warnings;
use strict;
use Tie::File;


tie my @array_file, 'Tie::File', "file1.txt" or die "can't tie file: $
+!";

my $matched_lines = '';

open my $fh,  '>', "file3.txt" or die "can't open file: $!";
open my $fh2, '<', "file2.txt" or die "can't open file: $!";
while ( defined( my $line = <$fh2> ) ) {
    chomp $line;
    foreach my $match (@array_file) {
        if ( $match eq $line and $match ne "") {
            $matched_lines .= $match.$/;
            next;
        }
    }
}
print {$fh} $matched_lines;
close $fh2 or die "can't close file:$!";
close $fh  or die "can't close file:$!";

untie @array_file;

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NOTE: The code above thus work,(or should work) but might not be so effiecient if it has a VERY VERY LARGE files to compare.

If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

In reply to Re: File handles in regular expressions by 2teez
in thread File handles in regular expressions by vikasdawar

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