import re
text = ("From: sender name\n"
"To: the recepient\n"
"Subject: well done!\n"
"Body: lorem ipsum lorem ipsum")
regex = re.compile(r"^(From: .*)\n(To: .*)", flags=re.IGNORECASE | re.MULTILINE)
print(regex.match(text).groups())
aW1wb3J0IHJlCgp0ZXh0ID0gKCJGcm9tOiBzZW5kZXIgbmFtZVxuIgogICAgICAgICAgICAiVG86IHRoZSByZWNlcGllbnRcbiIKICAgICAgICAgICAgIlN1YmplY3Q6IHdlbGwgZG9uZSFcbiIKICAgICAgICAgICAgIkJvZHk6IGxvcmVtIGlwc3VtIGxvcmVtIGlwc3VtIikKcmVnZXggPSByZS5jb21waWxlKHIiXihGcm9tOiAuKilcbihUbzogLiopIiwgZmxhZ3M9cmUuSUdOT1JFQ0FTRSB8IHJlLk1VTFRJTElORSkKcHJpbnQocmVnZXgubWF0Y2godGV4dCkuZ3JvdXBzKCkpIAo=