R 從字符串中刪除（NA）

Question

我有

"this is an example (NA)"

並希望有"this is an example"

gsub("(NA)", "", "this is an example (NA)")

不起作用。

我試過gsub

gsub("(NA)", "", "this is an example (NA)")
[1] "this is an example ()"

Answer 1

你可以試試：

"this is an example (NA)" -> x
gsub('\\(NA)', '', x)

Answer 2

另一種可能的解決方案，基於stringr ：

library(stringr)

string <- "this is an example (NA)"
str_remove_all(string, "\\s*\\(NA\\)\\s*")

#> [1] "this is an example"

Answer 3

您應該啟用fixed = TRUE

> gsub("(NA)", "", "this is an example (NA)", fixed = TRUE)
[1] "this is an example "

Answer 4

string <- "this is an example (NA)"

gsub(' \\(NA\\)', '', string)

[1] "this is an example"