如何删除R中的特定字符 [英] How to remove specific special characters in R

问题描述

我有一些这样的句子。

  c =在酸碱反应为什么它会创造水而不是H +？ 
  

我要删除除'？& + - /

$以外的所有特殊字符b
$ b

我知道如果我想删除所有特殊字符，我可以使用

  gsub（[[：punct：]]，，c）
在酸性反应page4中为什么会产生水而不是H
  

但是，一些特殊字符如+ - ？也被删除，我打算保留。

我尝试创建一个特殊字符串，我可以在这样的代码中使用

  gsub（[special_string]，，c）
  

最好我能做的是想出这个

  cat（！\＃$％ ; 
  

p> gsub（[cat（！\＃$％），但是下面的代码不起作用

< （）* ,.：; = = @ [\\] ^ _`{|}〜。）]，，c）
pre>

除了一些我想保留的特殊字符之外，我应该怎么做才能删除？

感谢

解决方案

  gsub（[^ [：alnum：] [：blank： +？&/ / \\-]，，c）
＃[1]在酸碱反应page4中为什么会产生水而不是H +？ 
  

I have some sentences like this one.

c = "In Acid-base reaction (page[4]), why does it create water and not H+?" 

I want to remove all special characters except for '?&+-/

I know that if I want to remove all special characters, I can simply use

gsub("[[:punct:]]", "", c)
"In Acidbase reaction page4 why does it create water and not H"

However, some special characters such as + - ? are also removed, which I intend to keep.

I tried to create a string of special characters that I can use in some code like this

gsub("[special_string]", "", c)

The best I can do is to come up with this

cat("!\"#$%()*,.:;<=>@[\\]^_`{|}~.")

However, the following code just won't work

gsub("[cat("!\"#$%()*,.:;<=>@[\\]^_`{|}~.")]", "", c)

What should I do to remove special characters, except for a few that I want to keep?

Thanks

解决方案

gsub("[^[:alnum:][:blank:]+?&/\\-]", "", c)
# [1] "In Acid-base reaction page4 why does it create water and not H+?"

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