I have a file which contains a date time stamp in the format day/month/yyyy h:m:s am or pm. I would like to do a search replace and insert date, then the time stamp back again, I would also like to figure out how to reverse the contents of a hash as my current hash is in the wrong order values,keys instead of keys,values. would something like this work?

 while ( my ($key, $value) = each(%hash) ) {
        %copy=(my $value=>$key);
    }
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