Try this out:

my (@dat) = ();

my @filters;
push @filters, sub { /active/ ? 1 : undef };
push @filters, sub { /anotherfilter/ ? 1 : undef };

open my $DATF, '<', $file_name;
while( chomp(my $line = <$DATF>) ) {

    foreach my $filter (@filters) {
        my $newline = $filter->($line) or next;
        push (@dat, $line);
        last;
    }

}

close($DATF);
[download]

An alternative is this:

use threads;
use Thread::Queue;

use constant MAXTHREADS => 2;

my $workQueue = Thread::Queue->new();
my $outQueue = Thread::Queue->new();

my @threads = map { threads->new( \&worker ) } 1..MAXTHREADS;

open my $DATF, '<', $file_name;
while ( <$DATF> ) {
    $workQueue->enqueue($_);
}
close $DATF;

$workQueue->end();

$_->join for @threads;

$outQueue->end();

my @dat;
while (my $line = $outQueue->dequeue()) {
    push @dat, $line;
}


sub worker {
    my @filters;
    push @filters, sub { /active/ ? 1 : undef };
    push @filters, sub { /anotherfilter/ ? 1 : undef };

    while ( chomp(my $line = $workQueue->dequeue()) ) {
        foreach my $filter (@filters) {
            my $newline = $filter->($line) or next;
            $outQueue->enqueue($line);
            last;
        }
    }
}
[download]

The benefit to multithreading is you can dial your performance up and down depending on how many resources are available to you. This currently requires you to read the entire file into memory first, however pushing the read process into a separate thread resolves that issue and pushing the outqueue processing into a separate thread also assists in reducing memory footprint (assuming you're doing something like writing the data into a filtered output file)

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.