use strict;
use Benchmark qw(cmpthese);

my @x;
my @result;

$x[0]= "mark " x 35;
$x[1]= "asdfasdfasdfasdfasdf " x 35;
$x[2]= "as " x 31;
$x[3]= "asdfasdfasdfasdfasdfasdf " x 100;
$x[4]= "asdfasdfasdfasdfasdfasdf " x 10;

cmpthese (-5, {
    'regexp' =>
        sub {
            my $i;
            foreach (@x) {
                /^((?:\S+\s*){1,30})/;
                $result[$i++]{REx} = $1;
            }
        },
    'split_join' =>
        sub {
            my $i;
            foreach (@x) {
                $result[$i++]{split} =
                    join " ", (split " ", $_,31)[0..29];
            }
        },
    'for_index_substr' =>
        sub {
            my $i;
            foreach (@x) {
                my $ind = index ($_, " ");
                for my $foo (0..28) {
                    last if $ind == -1;
                    $ind = index $_, " ", $ind + 1;
                }
                $result[$i++]{index} = substr($_,0,$ind);
            }
        },
} );

for (@result) {
    print "bad!" unless ($_{REx} eq $_{split} and
                         $_{split} eq $_{index});
}