Precompiling the regexes should provide a speedup and using List::MoreUtils::any() may do if the chance of a match is good since the test will shortcut on success. Naturally you will benchmark;-)
use List::MoreUtils qw(any);
open my $OUT, '>', 'Result_file.txt' or die "Cannot create file: $!\n"
+;
open my $IN, '<', 'Input_file.dat' or die "Cannot read file: $!\n";
# precompile the regexes.
@tag_rx = map {qr/$_/} @tag;
while ( my $data = <$IN> ) {
print $OUT $data if any { $data =~ /$_/ } @tag_rx;
}
close $IN;
close $OUT;
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