$ perl -E '
> $rowTxt = ( q{0123456789} x 2 ) . q{0123};
> @groups = $rowTxt =~ m{(?=(.{10}))}g;
> say for @groups;'
0123456789
1234567890
2345678901
3456789012
4567890123
5678901234
6789012345
7890123456
8901234567
9012345678
0123456789
1234567890
2345678901
3456789012
4567890123
$