0211121253 Mike Dell ID06533
0211121253 Leo De Vinci ID02014
0211121253 Joe De La Marco ID65255

##</code><code>##

0211121253|Mike|Dell|ID06533
0211121253|Leo|De Vinci|ID02014
0211121253|Joe|De La Marco|ID65255

##</code><code>##

0211121253|Mike|Dell|ID06533
Missing data|Leo|De Vinci|ID02014 <--delete line
0211121253|Joe|De La Marco|ID65255

##</code><code>##

$_ =~\b\sID\d; 
$_ =~^\d+;