But without some sort of grep step, that produces a spurious leading empty string in the output list:

c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"my $string = '<1,22>:<5,7>:<333,0>';
 my @x = split /\D+/, $string;
 dd \@x;
"
["", 1, 22, 5, 7, 333, 0]
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