See my response in an old thread: Re: sort an array according to another array

Also, you're initializing @array2 with qq() which makes a string, not a list of values. You want either qw( list of words ) or ('word', 'word', 'word') or (value, value, value) without the qq. If you think of your identifiers as words, then you should use lt/eq/gt instead of </==/> when comparing them, too.