How to replace text in a string with C #?

Question

I have this piece of code, but it does not work.

text = text.Replace("\xEF\xBF\xBD", "?"); 

Does anyone know how to replace the text "\xEF\xBF\xBD" with "?" in C # String .

Answer 1

Short answer (a little guess):

 text = text.Replace("\xFFFD", "?"); 

And learn Unicode and character encodings , especially utf-8.

Long answer:

Ok, you mean "\ xEF \ xBF \ xBD" literally? That is, a string consisting of these characters:

 backslash, uppercase latin character E, uppercase latin character F, backslash, uppercase latin character B, uppercase latin character F, backslash, uppercase latin character B, uppercase latin character D 

Then the answer will be as follows:

 text = text.Replace(@"\xEF\xBF\xBD", "?"); 

Or you execute character sequences that are described by C # escape sequences "\ xEF \ xBF \ xBD", namely:

 LATIN SMALL LETTER I WITH DIAERESIS, INVERTED QUESTION MARK, VULGAR FRACTION ONE HALF 

(which will display as "�)? Then your code will be correct:

 text = text.Replace("\xEF\xBF\xBD", "?"); 

Or do you want to replace the byte sequence

 EF BF BD 

(in fact, it could be a representation of the utf-8 unicode replacement character, FFFD, which is often displayed as "")?

This is just a wild hunch, but intuitively says that you really want to achieve the latter. Now the .Net string contains characters, not bytes, but on condition that you read these bytes, for example. from a file like utf-8, the answer will be as follows:

 text = text.Replace("\xFFFD", "?"); 

Answer 2

You need to avoid backslashes.

 text = text.Replace("\\xEF\\xBF\\xBD", "?"); 

Alternatively, you can avoid the entire line with the @ character:

 text = text.Replace(@"\xEF\xBF\xBD", "?");