string 从R中的字符串中删除字符
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Removing characters from string in R
提问by ben_aaron
I have some tabs or space breaks in my R output (I suspect the problem in the task from which the output comes), making it look like this:
我的 R 输出中有一些制表符或空格符（我怀疑输出来自任务中的问题），使其看起来像这样：
[1841] "\t\t\tGreen\n\t\t"
[1842] "Blue"
[1843] "\t\t\tRed\n\t\t"
For a colleague I have to read this into SPSS and that gives some trouble when reading this as txt data, so I wanted to remove the \t and \n parts in my string:
对于一位同事，我必须将其读入 SPSS，这在将其作为 txt 数据读取时会出现一些问题，因此我想删除字符串中的 \t 和 \n 部分：
str_replace(mydata, "([\n])", "")
Tried it with both \n and \t or combinations, but never quite worked.
尝试了 \n 和 \t 或组合，但从未奏效。
Where is my mistake?
我的错误在哪里？
回答by hwnd
You need to use str_replace_allto remove the multiple accounts of whitespace characters. Why not use base R to remove these characters instead of loading the stringrpackage?
您需要使用str_replace_all删除多个空格字符的帐户。为什么不使用 base R 来删除这些字符而不是加载stringr包？
gsub('[\t\n]', '', mydata)
回答by akrun
Try
尝试
library(stringr)
str1 <- c("\t\t\tGreen\n\t\t", "Blue", "\t\t\tRed\n\t\t" )
str_replace_all(str1, "([\n\t])", "")
#[1] "Green" "Blue" "Red"
Or using stringi
或使用 stringi
library(stringi)
stri_replace_all_regex(str1, "[\n\t]", "")
#[1] "Green" "Blue" "Red"
Update
更新
Suppose, if there are multiple words in the string, the gsuband str_replace_allwould provide the same output.
假设，如果字符串中有多个单词，则gsub和str_replace_all将提供相同的输出。
x <- c("\t\t\tGreen\n\t\t", "Blue", "\t\t\tRed\n\t\t yellow")
str_replace_all(x, '[\n\t]', '')
#[1] "Green" "Blue" "Red yellow"
Another option would be to use stripfrom qdap
另一种选择是使用stripfromqdap
library(qdap)
strip(x, lower.case=FALSE)
#[1] "Green" "Blue" "Red yellow"
## Or...
Trim(clean(x))
#[1] "Green" "Blue" "Red yellow"
