从字符串中删除特定unicode范围的字符

I have a program that is parsting tweets in real time from the twitter stream api. Before storing them, I am encoding them as utf8. Certain characters end up appearing in the string as ?, ??, or ??? instead of their respective unicode codes and cause problems. Upon further investigation, I found that the problematic characters are from the I have a program that is parsting tweets in rea