use strict;
use Benchmark;

my $file = shift || 'no_file';

timethese(
    1,
    {
        'one_string'  => sub { one_string() },
        'two_string'  => sub { two_string() },
    }
);

sub one_string {
    my $filter = '00901808';
    my $re = qr/$filter/o;
    my @matched;
    open (my $FH, "<$file");
    while (my $rec = <$FH>) {
	if ( $rec =~ $re) {
            push @matched, $rec;
	}
    }
    close $FH;
}

sub two_string {
    my $filter = '00901808|87654321';
    my $re = qr/$filter/o;
    my @matched;
    open (my $FH, "<$file");
    while (my $rec = <$FH>) {
	if ( $rec =~ $re) {
            push @matched, $rec;
	}
    }
    close $FH;
}

__END__