You do not need the for becuase grep loops over the array you give it. Please change:

 
 for (@positions) {@positions = grep $_->[1] =~ /ac/i, @positions;}

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to:

 
 @positions = grep $_->[1] =~ /ac/i, @positions;

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In reply to Re^5: filtering an array by philiprbrenan
in thread filtering an array by prbndr

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