twitter analysis in R clean tweets
clean_tweet = gsub("&", "", unclean_tweet)
clean_tweet = gsub("(RT|via)((?:\b\W*@\w+)+)", "", clean_tweet)
clean_tweet = gsub("@\w+", "", clean_tweet)
clean_tweet = gsub("[[:punct:]]", "", clean_tweet)
clean_tweet = gsub("[[:digit:]]", "", clean_tweet)
clean_tweet = gsub("http\w+", "", clean_tweet)
clean_tweet = gsub("[ t]{2,}", "", clean_tweet)
clean_tweet = gsub("^\s+|\s+$", "", clean_tweet)