"Preprocessing of Comments for Sentiment Analysis"

Team,

I want to do preprocessing of the Comments which I want to use further for Sentiment Analysis.
How I will be able to do Preprocessing (includes conversion of Comment to lower case, remove stopwords, remove punctuations [i,e, :,.# @etc]) from the comments which I had collected in .csv file.

Is the sentiment analysis possible in Rapidminer (i.e. Classify any particular comment into Positive or Negative sentiment)


Thanks,

Amit