import re as r
from datetime import datetime
text = 'Cont:7225811153; BillNo4896TableNoR306 07-Jun-201921:18:40'
id = r.search(r'\d{2}-\w{3}-\d{4}',text)
if id:
print(datetime.strptime(id.group(),'%d-%b-%Y').date())
aW1wb3J0IHJlIGFzIHIKZnJvbSBkYXRldGltZSBpbXBvcnQgZGF0ZXRpbWUKdGV4dCA9ICdDb250OjcyMjU4MTExNTM7IEJpbGxObzQ4OTZUYWJsZU5vUjMwNiAwNy1KdW4tMjAxOTIxOjE4OjQwJwppZCA9IHIuc2VhcmNoKHInXGR7Mn0tXHd7M30tXGR7NH0nLHRleHQpCmlmIGlkOgoJcHJpbnQoZGF0ZXRpbWUuc3RycHRpbWUoaWQuZ3JvdXAoKSwnJWQtJWItJVknKS5kYXRlKCkpCgk=