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  1. or download this
    if(@array[3..4] =~ /\S/) {
    do stuff;
}
  2. or download this
    if($array[4] =~ /\S/) {
    do stuff;
}
  3. or download this
    if("@array[3,4]" =~ /\S/) {
or
if ("@array[3,4]" =~ tr/ \t\n//c) {