import re
rx = r"\b(?<!\.)\d{1,2}(?:([/-])\d+\1|(?:th|st|[nr]d)?\s*(?:(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[a-z]*))\s*(?:\d{4}|\d{2})\b"
s = "Lithium 0.25 (7/11/77).  LFTS wnl.  Urine tox neg.  Serum tox\nfluoxetine 500; otherwise neg.  TSH 3.28.  BUN/Cr: 16/0.83.  Lipids unremarkable.  B12 363, Folate >20.  CBC: 4.9/36/308 Pertinent Medical\nReview of Systems Constitutional:\n\nThe patient is a 44 year old married Caucasian woman, unemployed Decorator, living with husband and caring for two young children, who is referred by Capitol Hill Hospital PCP, Dr. Heather Zubia, for urgent evaluation/treatment till first visit with Dr. Toney Winkler IN EIGHT WEEKS on 24 Jan 2001"
print([x.group(0) for x in re.finditer(rx, s, re.I)])

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