Are you evaling the output from Data::Dumper into a datastructure again so that it takes on its original form, or are you attempting to parse it as a single string?

What else will always occur in sequence with '20' and '50' so that you can detect the difference between the '20' in 'Y2001.11', and '11.2004'? In other words, what makes that first 20 special, and the second 20 not? Is there some pattern you could match? Are there a set number of space-delimited fields perhaps? There has to be some form of regularity, either in field width, field delimiters, text patterns, etc. If there's nothing regular about the data, you've got a problem.

The problem that we have is that we have no idea what criteria to use, since we know nothing about the data except for one single isolated example.

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