Next, workers send data to the manager process via MCE->gather instead of sending to STDOUT.

use strict;
use warnings;

use MCE::Loop;

my @patterns = ( "biopattern1", "biopattern2", "biopattern3" );
my $search   = join('|', @patterns);
my $regex    = qr/$search/;

open my $fh, "gunzip -c in.fastq.gz |" or die "open error: $!";

MCE::Loop->init(
    max_workers => 4,
    chunk_size => 50,
    RS => "\n@"
);

my @found = MCE::Loop->run( sub {
    my ( $mce, $chunk_ref, $chunk_id ) = @_;

    for my $i ( 0 .. $#{ $chunk_ref } ) {
        if ( $chunk_ref->[$i] =~ /$regex/ ) {
            MCE->gather( $chunk_ref->[$i] );
        }
    }

}, $fh );

MCE::Loop->finish();

close $fh;

print join('', @found);
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