小编Jes*_* CT的帖子

我希望根据条件连接两个数据帧，在本例中，一个字符串位于另一个字符串内。假设我有两个数据框，

df1 <- data.frame(fullnames=c("Jane Doe", "Mr. John Smith", "Nate Cox, Esq.", "Bill Lee III", "Ms. Kate Smith"), 
                  ages = c(30, 51, 45, 38, 20))

       fullnames ages
1       Jane Doe   30
2 Mr. John Smith   51
3 Nate Cox, Esq.   45
4   Bill Lee III   38
5 Ms. Kate Smith   20

df2 <- data.frame(lastnames=c("Doe", "Cox", "Smith", "Jung", "Smith", "Lee"), 
                  ages=c(30, 45, 20, 28, 51, 38), 
                  homestate=c("NJ", "CT", "MA", "RI", "MA", "NY"))
  lastnames ages homestate
1       Doe   30        NJ
2       Cox   45 …