#!/bin/bash s="Leonarfdsdy Dandfiel, Ingendfdfdfieur - Leon.inrombach, Hinderusen, 485,47580,SANKT VITH,BELGIQUE,0442345,2058560,FR" sed -E 's/^([^,]*),([^,]*),([^,]*)((,[^,]*){7})$/\1\2\3\4/' <<< "$s"
Standard input is empty
Leonarfdsdy Dandfiel Ingendfdfdfieur - Leon.inrombach Hinderusen, 485,47580,SANKT VITH,BELGIQUE,0442345,2058560,FR