... and to preserve the quotes using Text::ParseWords, if desired:

use strict;
use warnings;

use Text::ParseWords;
my $line  = q(a,b,"hey, you","str1, str2, str3",end);
my @words = quotewords(',', 1, $line);
print "$_\n" for @words;

__END__

a
b
"hey, you"
"str1, str2, str3"
end
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