import re
text = 'From: mathew <mathew@mantis.co.uk>\nSubject: Alt.Atheism FAQ: Atheist Resources\n\nArchive-name: atheism/resources\nAlt-atheism-archive-name:'
email_data = re.findall(r"\b[a-z-]+(?=:(?:\s|$))", text, re.IGNORECASE)
print(email_data)
aW1wb3J0IHJlCnRleHQgPSAnRnJvbTogbWF0aGV3IDxtYXRoZXdAbWFudGlzLmNvLnVrPlxuU3ViamVjdDogQWx0LkF0aGVpc20gRkFROiBBdGhlaXN0IFJlc291cmNlc1xuXG5BcmNoaXZlLW5hbWU6IGF0aGVpc20vcmVzb3VyY2VzXG5BbHQtYXRoZWlzbS1hcmNoaXZlLW5hbWU6JwplbWFpbF9kYXRhID0gcmUuZmluZGFsbChyIlxiW2Etei1dKyg/PTooPzpcc3wkKSkiLCB0ZXh0LCByZS5JR05PUkVDQVNFKQpwcmludChlbWFpbF9kYXRhKQ==