Your code prints "A B C D E F" for me, and I cannot see why it would print anything else.

This seems to work if you insist on using flip-flop: 

$x = 1; print join " ", grep { $x..(($x=0) or /D/) } qw(A B C D E F);

[download]
However, you could copy stuff from List::MoreUtils.

In reply to Re^3: Flip-flop won't DWIM by akho
in thread Flip-flop won't DWIM by wu-lee

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