Not trying to nitpick, but Op used plural for "category.txt files", so in case of housing_category.txt or job_category.txt, I guess we could have a slight change?: 
push(@file_list, $File::Find::name)
       if /\.(?:txt|jpg|gif)\z/i
       && !/category\.txt\z/i;

[download]
Update: well I wasn't exactly sure whether there could be more than one category.txt type file out there. Anyway OP has some solid code (And I really do like the ikegami code). I guess since I'm commenting more, I would point out to the op that "return" looks like what was intended rather than "next" at top of sub.

In reply to Re^2: Push, Matching, and File::Find by Marshall
in thread Push, Matching, and File::Find by JKasting

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