如何删除不属于其他字符向量的任何字符的某些字符？

Question

我有一个未清理的字符向量，我想删除该向量中不属于另一个字符向量的某些字符。所以基本上我知道我想保留什么，但我不知道要删除什么，这使得 gsub() 和 str_replace_all 很难工作。

我要清理的字符串是issue_uncleaned，长这样（不是完整版）：

[1] "Facebook Fact-checks; Coronavirus; TikTok posts "                                            
[2] "Facebook Fact-checks; Facebook posts "                                                       
[3] "Facebook Fact-checks; Coronavirus; Bloggers "                                                
[4] "Facebook Fact-checks; Facebook posts "                                                       
[5] "National; Criminal Justice; Crime; Facebook Fact-checks; Facebook posts "

我想用作过滤器来删除不需要的字符的字符串是151_issues，它看起来像这样（不是完整版本）：

[1] "Facebook Fact-checks"         "Coronavirus"       “Crime”

我想要的结果：（如果还有办法去掉开头或者最后的;就更好了）

[1] "Facebook Fact-checks; Coronavirus;  "                                            
[2] "Facebook Fact-checks;  "                                                       
[3] "Facebook Fact-checks; Coronavirus;  "                                                
[4] "Facebook Fact-checks;  "                                                       
[5] "; ; Crime; Facebook Fact-checks;  "

非常感谢您的帮助！

Answer 1

使用 strsplit 然后 intersect 和 paste 再次使用。

sapply(lapply(strsplit(v, '; '), intersect, issues), paste, collapse='; ')
# [1] "Facebook Fact-checks; Coronavirus" "Facebook Fact-checks"             
# [3] "Facebook Fact-checks; Coronavirus" "Facebook Fact-checks"             
# [5] "Facebook Fact-checks"

数据：

v <- c("Facebook Fact-checks; Coronavirus; TikTok posts", "Facebook Fact-checks; Facebook posts", 
"Facebook Fact-checks; Coronavirus; Bloggers", "Facebook Fact-checks; Facebook posts", 
"National; Criminal Justice; Crime; Facebook Fact-checks; Facebook posts"
)
issues <- c("Facebook Fact-checks", "After the Fact", "Animals", "Bankruptcy", 
"Border Security", "Ad Watch", "Agriculture", "Ask PolitiFact", 
"Baseball", "Bush Administration", "Afghanistan", "Alcohol", 
"Autism", "Bipartisanship", "Coronavirus")

Answer 2

issue_uncleaned <- c("Facebook Fact-checks; Coronavirus; TikTok posts ", "Facebook Fact-checks; Facebook posts ", "Facebook Fact-checks; Coronavirus; Bloggers ", "Facebook Fact-checks; Facebook posts ", "National; Criminal Justice; Crime; Facebook Fact-checks; Facebook posts ")
issues_151 <- c("Facebook Fact-checks", "Coronavirus", "Crime")
k <- strsplit(issue_uncleaned, "; ")
k <- lapply(k, trimws) # removes the white space at the end or beginning
k2 <- sapply(1:length(k), function(x, data){return(data[[x]][which(data[[x]] %in% issues_151)])}, data = k)
issue_cleaned <- sapply(k2, paste0, collapse = "; ")

如何删除不属于其他字符向量的任何字符的某些字符？

How to remove certain characters that don't belong to any characters of an other character vector?

r

str-replace

gsub