如何在R字符串中转义反斜杠 [英] How to escape backslashes in R string

问题描述

我正在使用R将文字写入文件：

 > x1 =\\str
> x2 =\\\str
错误：'\s'是字符串中无法识别的转义，起始于\\\s
> x2 =\\\\str
>写（file ='test'，c（x1，x2））
  

当我打开名为 test ，我看到：

  \str 
 \\str 
  

如果我想获取一个包含5个反斜杠的字符串，我应该写10个反斜杠，这样吗？

  x =\\\\\\\\\\ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ ...]  如果我想得到一个包含5个 \ 的字符串，我应该写10个 \    [...] 
 
 
要在字符串中写入单个 \ ，请将其写为\\。
 
 
 
这是因为 \ 是一个特殊字符，保留给转义后面的字符它。 （也许你将 \\\
 识别为换行符。）如果要编写一个包含单个。您将其写为\。
 
 
 
  \\ \\\\str 无效，是因为它被解释为 \\ （对应于单个 \ ），后跟 \s ，这是无效的，因为转义 s 没有意义。
 
I'm writing strings to a file using R:
> x1="\\str"
> x2="\\\str"
Error: '\s' is an unrecognized escape in character string starting "\\\s"
> x2="\\\\str"
> write(file='test',c(x1,x2))
When I open the file named test, I see this:
\str
\\str
If I want to get  a string containing 5 backslashes, should I write 10 backslashes, like this?
x="\\\\\\\\\\str" 

解决方案

  
[...] If I want to get a string containing 5 \ ,should i write 10 \ [...]
Yes, you should. To write a single \ in a string, you write it as "\\".

This is because the \ is a special character, reserved to escape the character that follows it. (Perhaps you recognize \n as newline.) It's also useful if you want to write a string containing a single ". You write it as "\"".

The reason why \\\str is invalid, is because it's interpreted as \\ (which corresponds to a single \) followed by \s, which is not valid, since "escaped s" has no meaning.

                        
这篇关于如何在R字符串中转义反斜杠的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！