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karls-mac-mini:monks karl$ perl -MData::Dump  -E 'dd split /[^a]/, qq(
+dftaatzaaadfaa)';
("", "", "", "aa", "", "aaa", "", "aa")
...

karls-mac-mini:monks karl$ perl -E 'say scalar grep {/aa/} split /[^a]
+/, qq(dftaatzaaadfaa)';
3