[英]R Removing words from a string in a dataframe
假设我有以下数据集:
Date_Received = c("Addition 1/2/2018", "Swimming Pool 1/8/2018", "Abandonment 1/9/2018", "Existing Approval 3/14/2018", "Holding Tank 5/11/2018")
Date_Approved = c("1/2/2018", "1/8/2018", "1/9/2018", "SB 3/21/2018", "JW 5/11/2018")
我想删除Date_Received
列中date
之前的characters
,以便以后可以使用lubridate
将其转换为date
类型数据格式。
我尝试使用以下代码,但它只删除了first
大写字母。
我怎样才能解决这个问题?
期望的输出:
Date_Received Date_Approved
1/2/2018 1/2/2018
1/8/2018 1/8/2018
1/9/2018 1/9/2018
3/14/2018 SB 3/21/2018
5/11/2018 JW 5/11/2018
代码
library(tidyverse)
df = data.frame(Date_Received, Date_Approved)
df= df%>% mutate(Date.Received = trimws(Date_Received, whitespace = "[A-Z]*\\s*")) %>% filter(nzchar(Date.Received))
我们可以使用trimws
,它有一个空格参数(如您在代码中使用的那样),可用于指定空格。
library(dplyr)
df %>%
mutate(Date_Received = trimws(Date_Received, "left", "\\D"))
或使用str_replace_all
:
library(stringr)
df %>%
mutate(Date_Received = str_replace_all(Date_Received, "^\\D+", ""))
输出
Date_Received Date_Approved
1 1/2/2018 1/2/2018
2 1/8/2018 1/8/2018
3 1/9/2018 1/9/2018
4 3/14/2018 SB 3/21/2018
5 5/11/2018 JW 5/11/2018
使用sub
的另一个选项:
df$Date_Received <- sub("^\\D+", "", df$Date_Received)
让生活简单:
Date_Received = c("Addition 1/2/2018", "Swimming Pool 1/8/2018", "Abandonment 1/9/2018", "Existing Approval 3/14/2018", "Holding Tank 5/11/2018")
stringr::word(Date_Received, -1)
[1] "1/2/2018" "1/8/2018" "1/9/2018" "3/14/2018" "5/11/2018"
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