Here for my reference; adapt for your convenience:
# for snapshot in `zfs list -H -t snapshot -r /opt/datastore | egrep '2009\-0[1-8]' | awk '{print $1}'`; do zfs destroy $snapshot; done
or possibly:
# for snapshot in `zfs list -H -t snapshot -r /opt/datastore | egrep '2009\-0[1-8]' | awk '{print $1}'`; do zfs destroy -r $snapshot; done
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