import re
strings = [
'title : Booking things author J smith',
'title : Unbe God author: K. sweet'
]
for x in strings:
m = re.search(r"(?:title\s*:?\s*)([\w\s]+)(?=author)", x)
if m:
print(m.group(1))
aW1wb3J0IHJlCnN0cmluZ3MgPSBbCid0aXRsZSA6IEJvb2tpbmcgdGhpbmdzIGF1dGhvciBKIHNtaXRoJywKJ3RpdGxlIDogVW5iZSBHb2QgYXV0aG9yOiAgSy4gc3dlZXQnCl0KZm9yIHggaW4gc3RyaW5nczoKCW0gPSByZS5zZWFyY2gociIoPzp0aXRsZVxzKjo/XHMqKShbXHdcc10rKSg/PWF1dGhvcikiLCB4KQoJaWYgbToKCQlwcmludChtLmdyb3VwKDEpKQ==