在Swift中转义反斜杠 [英] Escaping backslash in Swift

问题描述

我正在将正则表达式作为字符串值发送给CloudKit，并且似乎不喜欢它，将 \\ 替换为 \ 。但是，一旦我从我的应用程序中获取这个值，我想以原来的形式，以 \\ 而不是 \\ \\ 。

我不知道如何在Swift中管理这种转义的字符，因为我甚至不能使用 \ 我的代码，但我仍然能够管理他们从CloudKit得到他们。这是一个String的例子：

  var onlyOneBackslash：String = valueFromCloudKit 
 print（onlyOneBackslash）// booking\ .com 
  

如何将反斜杠转义为转换 booking\.com into booking\\.com ？

解决方案

双重反斜杠仅存在于代码中，这是编译器的惯例。它不会存在于字符串本身，只是在Swift代码中。

如果您希望在字符串中使用双反斜杠，则需要在代码中有四个反斜杠。或者使用String方法用双反斜杠替换单个反斜杠。

代码示例：

 code> let originalString =1\\\2
 print（originalString：\（originalString））
 let newString = originalString.stringByReplacingOccurrencesOfString（\\ withString：\\\\\，选项：.LiteralSearch，range：nil）
 print（newString：\（newString））
  / pre> 
 
 
输出：
  originalString：1\2 
 newString：1\\\2 
  
 
I'm sending regular expressions to CloudKit as a String value and it doesn't seem to like it, replacing \\by \. However, once I'm getting this value from my app I would like to retransform it in its original form, with \\instead of \. 

I don't know how to manage this kind of escaped characters in Swift because I cannot even set a String with a \ in my code but I'm still able to manage them when getting them from CloudKit. Here is an example of String:
var onlyOneBackslash: String = valueFromCloudKit
print(onlyOneBackslash) // booking\.com
How to escape the backslash to transform booking\.com into booking\\.com?
解决方案
The double backslash exists only in your code, it is a convention of the compiler. It never exists in the string itself, just in the Swift code.

If you want a double backslash in the string you need to have four backslashes in your code. Or use a String method to replace single backslashes with double backslashes.

Code example:
let originalString = "1\\2"
print("originalString: \(originalString)")
let newString = originalString.stringByReplacingOccurrencesOfString("\\", withString: "\\\\", options: .LiteralSearch, range: nil)
print("newString: \(newString)")
Output:
originalString: 1\2  
newString: 1\\2  


                        
这篇关于在Swift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！