Start with Text::CSV esp with these programs that are in the Text::CSV_XS distribution
examples/csv-check Script to check a CSV file/stream
examples/csvdiff Script to shoff diff between sorted CSV files
examples/parser-xs.pl Parse CSV stream, be forgiving on bad lines
examples/speed.pl Small benchmark script

In reply to Re: extracting data from a file by Anonymous Monk
in thread extracting data from a file by indy07

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