从 R 中的列中删除下划线和前斜杠

Question

我希望从下面的列中提取所有数字详细信息

head(df$Session, 5)
[1] "Session_01122016" "Session_02122016" "Session_03122016" "Session_04122016" "Session_05122016"

head(df$Date, 5)
    [1] "01/12/2016" "02/12/2016" "03/12/2016" "04/12/2016" "05/12/2016"

我的预期输出是:

head(df$SessionOutput, 5)
[1] "01122016" "02122016" "03122016" "04122016" "05122016"

head(df$DateOutput, 5)
    [1] "01122016" "02122016" "03122016" "04122016" "05122016"

请问可以这样做吗？

谢谢。

Answer 1

如果每列中的模式都是一致的，您可以简单地使用 gsub() 删除不需要的模式:

df <- data.frame(
  Session = c("Session_01122016","Session_02122016","Session_03122016","Session_04122016","Session_05122016"),
  Date = c("01/12/2016","02/12/2016","03/12/2016","04/12/2016","05/12/2016"),
  stringsAsFactors = F
)

df$SessionOutput <- gsub("Session_", "", df$Session)
df$DateOutput <- gsub("/", "", df$Date, fixed = T)

> head(df$SessionOutput )
[1] "01122016" "02122016" "03122016" "04122016" "05122016"
> head(df$DateOutput )
[1] "01122016" "02122016" "03122016" "04122016" "05122016"