@res =$_ =~/(\d{4}-\d\d-\d\d)/g
# gets them all but also from lines without 'dates processed'

@res = $_ =~/(\d{4}-\d\d-\d\d).*dates processed: (\d{4}-\d\d-\d\d,? ?)*/g
# only returns first of trailing list

@res = $_ =~/(\d{4}-\d\d-\d\d).*dates processed: ((\d{4}-\d\d-\d\d)*)/
# gets the right number of results but the final list all the same value!