How do I find any string Perl?

Question

I am new at Perl and I've got a problem. I would like to find any string in this part of code:

my $change = $item->look_down(
  _tag=> 'td',
  class => 'colZmiana change  ' #?????
);

In my HTML code, there is colZmiana change up, colZmiana change down or colZmiana change. I would like class => find every colZmiana change.

Could anyone help me ?