如何检查批处理列表中是否包含字符串

I try and avoid using batch if at all possible, as I don't like the syntax, or the lack of an inbuilt IDE, so I am pretty much a beginner with it. What I am trying to do is write an installation program, mainly in python but this part has to be done in batch, and i have written all the installation instructions, but i am now stuck on checking a user's input. What I want it to do is to get a users input (done) and then tell if it is I try and avoid using batch if at all possible,