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in reply to Re^2: Illegal character CTRLCHAR code 27
in thread Illegal character CTRLCHAR code 27

I think you're not testing your code properly:
$ perl -wE '$_="\01\02"; say length; tr/\000-\007//; say length' 2 2

Nothing removed. (Update: But replaced, see Re^5: Illegal character CTRLCHAR code 27) Still you're on the right track. For deleting with tr///, you need a trailing /d:

$ perl -wE '$_="\01\02"; say length; tr/\000-\007//d; say length' 2 0
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