my $file1 = \<<"END1";
he/is/man/reg[30]
what/goes/on/reg[32]
i_am_a_man
you_are_reg[60]
END1
my $file2 = \<<"END2";
/is/man/reg[30]
are_reg[60]
try/to/do/reg[65]
you/reg[31]
END2
open(my $f3, ">", "C:/Users/Siddharth/Desktop/two.txt")
or die "Can't open < input.txt: $!";
open my $h2, '<', $file2 or die "cannot open file2";
my %map = <$h2>;
my ($regex) = map { qr/$_/ } # 2.
join '|', map {quotemeta}
close $h2;
open my $h1, '<', $file1 or die "cannot open file1";
my @a1= <$h1>;
#print grep {$_ =~ $regex} @a1;
print $f3 grep {$_ !~ $regex} @a1;
2020-06-21 Athanasius added code tags.