Turns out flip-flops maintain their state even across subroutine calls
Not if closures are involved:

sub mk_flipflop {
 my ($start, $end) = @_;
 return sub { /$start/../$end/ }
}

for my $fh (@fhs) {
  my $ff = mk_flipflop(qr/^PP_START$/, qr/^PP_END$/);

  while (<$fh>) {
    $ff->() or next;

    # process line
  }
}

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In reply to Re^3: Resetting a flip-flop operator by runrig
in thread Resetting a flip-flop operator by AppleFritter

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