* Joerg Plate wrote in de.comp.lang.perl.misc:
>Wie wäre es mit:
>
>        $string = q(131500); substr($string,4,0)=":"; substr($string,2,0)=":";

Was ja so viel anders ist, als mein wesentlich lesbareres

  substr$z=>$_=>0=>':'for 2,5;

Fragezeichen.

An XY problem is when you want to do X, but you ask how to do Y
instead, because you've decided that Y is the best way to accomplish X.