[0] Perl> print $string;;
2648117951505438300028047571976236505346

@sets_of_six = ( $string =~ m{ (.{6}) }xmsg );;

print for @sets_of_six;;
264811
795150
543830
002804
757197
623650

##</code><code>##

@sets_of_six = $string =~ m{ (.{0,6}) }xmsg;;

print for @sets_of_six;;
264811
795150
543830
002804
757197
623650
5346