This keeps everything before a period:
这让一切都提前了一个周期:
gsub("\\..*","", data$column )
how to keep everything after the period?
经期后如何保存一切?
4 个解决方案
#1
14
To remove all the characters before a period in a string(including period).
删除字符串中句点(包括句点)前的所有字符。
gsub("^.*\\.","", data$column )
Example:
例子:
> data <- 'foobar.barfoo'
> gsub("^.*\\.","", data)
[1] "barfoo"
To remove all the characters before the first period(including period).
在第一个周期(包括周期)之前删除所有字符。
> data <- 'foo.bar.barfoo'
> gsub("^.*?\\.","", data)
[1] "bar.barfoo"
#2
2
You could use stringi
with lookbehind
regex
你可以使用stringi和lookbehind regex。
library(stringi)
stri_extract_first_regex(data1, "(?<=\\.).*")
#[1] "bar.barfoo"
stri_extract_first_regex(data, "(?<=\\.).*")
#[1] "barfoo"
If the string doesn't have .
, this retuns NA
(it is not clear about how to deal with this in the question)
如果字符串没有,这个retuns NA(问题中不清楚如何处理)
stri_extract_first_regex(data2, "(?<=\\.).*")
#[1] NA
###data
data <- 'foobar.barfoo'
data1 <- 'foo.bar.barfoo'
data2 <- "foobar"
#3
1
use this :
用这个:
gsub(".*\\.","", data$column )
this will keep everything after period
这将使以后的一切
#4
1
If you don't want to think about the regex for this the qdap
package has the char2end
function that grabs from a particular character until the end of the string.
如果您不想考虑这个正则表达式,那么qdap包有一个char2end函数,它可以从一个特定的字符捕获到字符串的末尾。
data <- c("foo.bar", "foo.bar.barfoo")
library(qdap)
char2end(data, ".")
## [1] "bar" "bar.barfoo"
#1
14
To remove all the characters before a period in a string(including period).
删除字符串中句点(包括句点)前的所有字符。
gsub("^.*\\.","", data$column )
Example:
例子:
> data <- 'foobar.barfoo'
> gsub("^.*\\.","", data)
[1] "barfoo"
To remove all the characters before the first period(including period).
在第一个周期(包括周期)之前删除所有字符。
> data <- 'foo.bar.barfoo'
> gsub("^.*?\\.","", data)
[1] "bar.barfoo"
#2
2
You could use stringi
with lookbehind
regex
你可以使用stringi和lookbehind regex。
library(stringi)
stri_extract_first_regex(data1, "(?<=\\.).*")
#[1] "bar.barfoo"
stri_extract_first_regex(data, "(?<=\\.).*")
#[1] "barfoo"
If the string doesn't have .
, this retuns NA
(it is not clear about how to deal with this in the question)
如果字符串没有,这个retuns NA(问题中不清楚如何处理)
stri_extract_first_regex(data2, "(?<=\\.).*")
#[1] NA
###data
data <- 'foobar.barfoo'
data1 <- 'foo.bar.barfoo'
data2 <- "foobar"
#3
1
use this :
用这个:
gsub(".*\\.","", data$column )
this will keep everything after period
这将使以后的一切
#4
1
If you don't want to think about the regex for this the qdap
package has the char2end
function that grabs from a particular character until the end of the string.
如果您不想考虑这个正则表达式,那么qdap包有一个char2end函数,它可以从一个特定的字符捕获到字符串的末尾。
data <- c("foo.bar", "foo.bar.barfoo")
library(qdap)
char2end(data, ".")
## [1] "bar" "bar.barfoo"