Thanks a lot of your replay @Aviral Bhardwaj​ 

I try to not hard code it and eventually turn it to a function. This is a initial raw code, but it has problem,

val pattern="XX-***-XXXX-***";

val item="abcdefghijkl"

val patternindex=pattern.lastIndexOf("-");

val patternupdated= pattern.substring(0,patternindex);

var lenplus = pattern.indexOf("-")

var fitem=item.patch(lenplus, "-", 0)

val result = patternupdated.split("-")

    for ( a

    {

     val len= a.length() 

     // Displays output

      lenplus = len + lenplus+1

      fitem= fitem.patch(lenplus, "-", 0)

     println(fitem)

    } 

The result is wrong,

ab-cd-efghijkl

ab-cd-efg-hijkl

ab-cd-efg-hijk-l