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my $i = 0;
again:
$array[$i] *= 2 unless $array[$i] =~ /[^0-9]/;
goto again if ++$i <= $#array;

my $i = 0;
{$array[$i] *= 2 unless $array[$i] =~ /[^0-9]/;
 redo if ++$i <= $#array;}

/[^0-9]/ or $_ *= 2 for @array;