R 替换字符串而不更改其他嵌入字符串

我有以下数据框

df <- data.frame(c(1, 2, 3, 4), c("T-A1", "T-A1-2", "T-A1-3", "T-A1-4"), c("apple", "banana", "pear", "orange"))
names(df) <- c("num", "name", "fruit")

  num   name  fruit
1   1   T-A1  apple
2   2 T-A1-2 banana
3   3 T-A1-3   pear
4   4 T-A1-4 orange

我已使用此功能：

df$name <- gsub("T-A1", "T-A1-1", df$name)

然后我尝试了这个公式：

df$name <- gsub("T-A1", "T-A1-1", df$name, fixed = TRUE)

---

df$name您需要告诉
gsub
您要查找的字符串正是
T-A1

df$name <- gsub("^T-A1$", "T-A1-1", df$name)

##   num   name  fruit
## 1   1 T-A1-1  apple
## 2   2 T-A1-2 banana
## 3   3 T-A1-3   pear
## 4   4 T-A1-4 orange

df$name
df$name <- gsub("T-A1", "T-A1-1", df$name, fixed = TRUE)

df$name <- gsub("^T-A1$", "T-A1-1", df$name)

##   num   name  fruit
## 1   1 T-A1-1  apple
## 2   2 T-A1-2 banana
## 3   3 T-A1-3   pear
## 4   4 T-A1-4 orange