I'm pretty sure it's because your regex is wrong, which I mentioned in your other node Re^5: Processing data in on dir and copying, then processing into another dir . Give the exact filenames you are trying that regex with. 
@files = grep /^(\d+\D\d)_(LacZ|pgK|SD|SU)(.*)$/,@files;
# is not doing what you think

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In reply to Re: mv files from dir1 to dir2 by zentara
in thread mv files from dir1 to dir2 by lomSpace

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