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  1. or download this
    if (/^[[:allnum:]]{1,13}$/){
              =~ s/^([[:allnum:]]{1,13})$/$1.'X'/
}
  2. or download this
    if (/^[[:allnum:]]{1,13}$/){
           =~ s/^([[:allnum:]]{1})([[:allnum:]]{1,12})$/$s1 .'X'. $2/
}