You are soooo screwed the first time your input CSV has a comma in one of the text fields. In general, a regex is not the right tool for ?SV. Consider rewriting using Text::CSV_XS or Text::xSV, which will handle both your TAB and Comma separated files properly.
If you want to further abstract your logic from your data, you should probably look into Anydata, which will happily slurp up your files for you. The DBD::Anydata tool will even do the JOIN and SELECT on the two tables.
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