import re
p = re.compile(r'(?:[a-z0-9]{1,4}:+){3,5}[a-z0-9]{1,4}|\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}')
test_str = "from mail.example.com (example.com. [213.239.250.131]) by\n mx.google.com with ESMTPS id xc4si15480310lbb.82.2014.10.26.06.16.58 for\n <alex@example.com> (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256\n bits=128/128); Sun, 26 Oct 2014 06:16:58 -0700 (PDT)"
print(re.findall(p, test_str))
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