我处理一个数据帧是如下 id Comments
1 The apple fell far from the mango tree
2 I was born under a mango tree and a wandering star
3 Mules are made for packing and Mangoes for eating
这里还是比较新的R。我有微博的一列,我试图创建一个包含转推柄“RT @blahblah”,像这样的列: Tweets Retweetfrom
RT @john I had a good day RT @john
RT @josh I had a bad day RT @josh
这是我的代码: r$Retweetfrom <- str_extract_all(r$Twe