import re
pattern = r"^([A-Z][a-z]*(?:[^\S\n]+[A-Z][a-z]*)*)\n\n((?:(?![A-Z][a-z]+(?:[^\S\n]+[A-Z][a-z]*)*$).*(?:\n|$))+)"
s = ("This Is A Title\n\n"
"This is where the body starts.\n\n"
"And this is more body.")
print(re.findall(pattern, s))
aW1wb3J0IHJlCgpwYXR0ZXJuID0gciJeKFtBLVpdW2Etel0qKD86W15cU1xuXStbQS1aXVthLXpdKikqKVxuXG4oKD86KD8hW0EtWl1bYS16XSsoPzpbXlxTXG5dK1tBLVpdW2Etel0qKSokKS4qKD86XG58JCkpKykiCgpzID0gKCJUaGlzIElzIEEgVGl0bGVcblxuIgoJIlRoaXMgaXMgd2hlcmUgdGhlIGJvZHkgc3RhcnRzLlxuXG4iCgkiQW5kIHRoaXMgaXMgbW9yZSBib2R5LiIpCgkKcHJpbnQocmUuZmluZGFsbChwYXR0ZXJuLCBzKSk=