import re
s = 'I want to be able to replace many words, especially in this sentence, since it will help me solve by problem. That makes sense right?'
pattern = re.compile(r'words[,]|sentence[,]|problem[.]')
s = re.sub(pattern, "\\g<0>\n", s)
print(s)
aW1wb3J0IHJlCnMgPSAnSSB3YW50IHRvIGJlIGFibGUgdG8gcmVwbGFjZSBtYW55IHdvcmRzLCBlc3BlY2lhbGx5IGluIHRoaXMgc2VudGVuY2UsIHNpbmNlIGl0IHdpbGwgaGVscCBtZSBzb2x2ZSBieSBwcm9ibGVtLiBUaGF0IG1ha2VzIHNlbnNlIHJpZ2h0PycKcGF0dGVybiA9IHJlLmNvbXBpbGUocid3b3Jkc1ssXXxzZW50ZW5jZVssXXxwcm9ibGVtWy5dJykKcyA9IHJlLnN1YihwYXR0ZXJuLCAiXFxnPDA+XG4iLCBzKQpwcmludChzKQ==