You don't need \s

use warnings;
use strict;
use Data::Dumper;

my $line = 'hello world';
my @words = ($line =~ m/[a-zA-Z0-9]+/g);
print Dumper(\@words);

__END__

$VAR1 = [
          'hello',
          'world'
        ];
[download]

Please read: Writeup Formatting Tips