If using a module like Text::CSV_XS is an option, use its csv function with the filter attribute:

$ cat test.pl
use 5.20.0;
use warnings;

use List::Util qw(first);
use Text::CSV_XS qw(csv);

csv (in => *DATA, filter => { 2 =>
     sub { (first { $_[1][0] + $_ == $_[1][1] &&
                    $_[1][1] + $_ == $_[1][2] }
            1 .. 3) ? 0 : 1 }});
__END__
0,1,3,4,5,# +1 +2 keep
1,2,3,4,5,# +1 +1 skip
1,3,1,4,5,# +2 -2 keep
1,3,5,4,5,# +2 +2 skip
2,2,3,3,4,#  0  0 keep
0,3,6,4,5,# +3 +3 skip
1,0,0,4,5,# -1  0 keep
0,4,8,4,5,# +4 +4 keep weird python
0,5,10,,5,# +5 +5 keep
$

[download]
$ perl test.pl
0,1,3,4,5,"# +1 +2 keep"
1,3,1,4,5,"# +2 -2 keep"
2,2,3,3,4,"#  0  0 keep"
1,0,0,4,5,"# -1  0 keep"
0,4,8,4,5,"# +4 +4 keep weird pyhton"
0,5,10,,5,"# +5 +5 keep"
$

[download]

update: changed 1..4 to 1..3, as I misinterpreted the stupid counterintuitive python range function


Enjoy, Have FUN! H.Merijn

In reply to Re: Searching for Patterns in CSV by Tux
in thread Searching for Patterns in CSV by Fischer

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