Getting specific word from doc file respective of uppercase/lowercase using python

  pandas, python, python-3.x

I want to get some word in .doc file and append them all in list.

Doc file content :
"i love Audi
i love audi
i love AuDi "

When I give audi or Audi as an input, it should read all these three different “audi” and return list containing all three different audi.

Source: Python-3x Questions