在Ruby中如何避免单引号？ [英] How do I escape a single quote in Ruby?

问题描述

JSON中的某些内容包含单个字符串引用，所以我想确保任何单引号在传递到脚本之前被转义。

我已经尝试了以下内容：

 > irb 
> 1.9.3p194：001> x =这是一个真棒字符串
> => 这是一个真棒字符串
> 1.9.3p194：002> x.sub（'，\）
> => 这是一个真棒字符串
> 1.9.3p194：003> x.sub（'，\\）
> => 这是一个令人敬畏的字符串真棒字符串
  

但似乎无法获得正确的语法。 / p>

解决方案

原因 sub（'，\）不工作是因为\与相同。在双引号内，转义单引号是可选的。

原因 sub（'，\\\ / code>不起作用是因为\\扩展为反斜杠后跟单引号。在 sub 或 gsub 参数中，后面跟一些字符的反斜杠具有与相应的全局变量相当的特殊意义。特别是在这种情况下，全局变量 $'在最后一个匹配点之后保存子字符串。在 sub 或中的\\ gsub gsub 的 sub ：

  gsub（'）{\ \'} 
  




I am passing some JSON to a server via a script (not mine) that accepts the JSON as a string.

Some of the content of the JSON contains single quotes so I want to ensure that any single quotes are escaped before being passed to the script.

I have tried the following:

> irb
> 1.9.3p194 :001 > x = "that's an awesome string"
>  => "that's an awesome string" 
> 1.9.3p194 :002 > x.sub("'", "\'")
>  => "that's an awesome string" 
> 1.9.3p194 :003 > x.sub("'", "\\'")
>  => "thats an awesome strings an awesome string"

but can't seem to get the syntax right.

解决方案

The reason sub("'", "\'") does not work is because "\'" is the same as "'". Within double quotes, escaping of a single quote is optional.

The reason sub("'", "\\'") does not work is because "\\'" expands to a backslash followed by a single quote. Within sub or gsub argument, a backslash followed by some characters have special meaning comparable to the corresponding global variable. Particularly in this case, the global variable $' holds the substring after the last matching point. Your "\\'" within sub or gsub argument position refers to a similar thing. In order to avoid this special convention, you should put the replacement string in a block instead of an argument, and since you want to match not just one, you should use gsub instead of sub:

gsub("'"){"\\'"}

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