You need to reread grep
my @res = grep $_ split(",", "a,b,c,d,,f,,h"); #is a syntax error.
According to the POD when grep is not called with a block it requires a comma before the list you are working on.
So this will work as you expect.
my @res = grep $_, split(",", "a,b,c,d,,f,,h");
One dead unjugged rabbit fish later...
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