import re
pattern = r"\bBook Release Date: (\d+ [A-Z][a-z]+, \d{4})\b"
s = ("Book Release Date: 2 June, 2010 [Edition#5]\n"
"Book Release Date: 24 October, 1996")
print(re.findall(pattern, s))
aW1wb3J0IHJlCgpwYXR0ZXJuID0gciJcYkJvb2sgUmVsZWFzZSBEYXRlOiAoXGQrIFtBLVpdW2Etel0rLCBcZHs0fSlcYiIKCnMgPSAoIkJvb2sgUmVsZWFzZSBEYXRlOiAyIEp1bmUsIDIwMTAgW0VkaXRpb24jNV1cbiIKCSJCb29rIFJlbGVhc2UgRGF0ZTogMjQgT2N0b2JlciwgMTk5NiIpCgkKcHJpbnQocmUuZmluZGFsbChwYXR0ZXJuLCBzKSk=