import re
text = "abcd aacd. abcd\n adcd"
my_re = re.compile(r'\ba\wcd[.,]?\s*')
pat_iter = my_re.finditer(text)
for i in pat_iter:
print(i.group())
aW1wb3J0IHJlCnRleHQgPSAiYWJjZCBhYWNkLiBhYmNkXG4gYWRjZCIKCm15X3JlID0gcmUuY29tcGlsZShyJ1xiYVx3Y2RbLixdP1xzKicpCnBhdF9pdGVyID0gbXlfcmUuZmluZGl0ZXIodGV4dCkKCmZvciBpIGluIHBhdF9pdGVyOgogICAgcHJpbnQoaS5ncm91cCgpKQ==