You forgot to remove the trailing newline. (Note the \n in the OP's regex.) 

chomp;
my @fields = split /\t/, $_;

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And if you want to keep empty trailing fields, you'll need to specify the third parameter. 

chomp;
my @fields = split /\t/, $_, -1;

[download]

In reply to Re^2: Regex condition by ikegami
in thread Regex condition by Win

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