preg_match_all question

[Anon]

I have a question here.
I have this line:
"preg_match_all( "|(\w\s?[\w]+)\s((\s[0-9]+)+)|", $input, $output, PREG_SET_ORDER );"

Now when my $input has the value "Harpy 0 0 0 481 0 63 0 0 0' it devides it up as:
'Harpy 0' ''0' etc.

Now it only does this with the first one.
The second line it does it nicely with 'Harpy' '0' '0' etc.

Any of you know why it does the first line wrong ?