my @check = grep { chomp $_; $_ } <DATA>;

Map should be used for this not grep. Consider the following.

use warnings;
use strict;

my @check = grep { chomp $_; $_ } <DATA>; 

print ">>@check<<"

__DATA__
line1
0
line3

[download]

The output is:

>>line1 line3<<

Grep looks at the value the block returns and if true it returns $_. Map is used to do something to each element and pass along the result from each.

To me it is clearer and simpler to do this:

my @check = <DATA>;
chomp @check;

[download]

In reply to Re^3: Regular Expressions question by Lotus1
in thread Regular Expressions question by CJXJ220

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