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my $term = qr/"[^"\\]*(?>\\.[^"\\]*)*"|[^,"]*/;
my $term = qr/"[^"]*(?>""[^"]*)*"|[^,"]*/;
/^$term,$term,$term,($term)/o;
my $term = qr/"[^"\\]*(?>\\.[^"\\]*)*"|[^,"]*/; while (<DATA>) { ... 18,0,13,"6.2",1 19,D610,,"6.3,r1",1 20,2f78,15,"6.3,r2",1