How to replace two slash into one slash?

Question

We have the following code:

string str="\\u5b89\u5fbd\\";

We need output in the format:

"\u5b89\u5fbd\"

We have tried this code:

str.Replace("\\",@"\")

Its not working.

Answer 1

Try this

string str = "\\u5b89\u5fbd\\";
str = str.Replace(@"\\", @"\");

\ is a reserved sign. \\ escapes it and results in \
Adding @ at the start of a string tell the compiler to use the string as is and not to escape characters.

So use either "\\\\" or @"\\"

EDIT

\\u5b89\u5fbd\\ actually does not have two \ together. \ is just escaped.
The string results in \u5b89徽\. And in that string you can't replace \\ because there is only one \ together.

Answer 2

Have you tried this?

str.Replace("\\\\","\\");

Your example accomplish nothing. "\\" is an escaped version of \, and @"\" is another version of writing \. So your example replaces \ with \

EDIT Now I understand your problem. What you want can't actually be done, since that would cause the string to end with a single \, and that will not be allowed. \ denotes a start of a escape sequence, and needs something after it.

I think there are no good option here, since in your case \u5b89 is not a string, but an escape sequence for one specific character.

str.Replace("\\u5b89","\u5b89");

This works for your current example, but will only work with this one specific character, so I guess it wont help you much. The \ at the end you cannot replace with \, but I can't see why you need the string to end with this char either.

Your best bet is to make sure that the \ does not occur at the start of the string in the first place, instead of trying to get rid of it afterwards.