You meant

 ...
 $text =~ s/[\000-\009]/ /g;
 ...
}
[download]

But it does something like

 ...
 $text =~ s/[\000-\000]/ /g; # does nothing
 $text =~ s/[9]/ /g;
 ...
[download]

BTW, maybe it's sometimes much faster to use the tr/\000-\011/ / operator, but that may depend.

Regards

mwa