String replace diacritics in C#

17,839

Solution 1

It seems you want to strip off diacritics and leave the base character. I'd recommend Ben Lings's solution here for this:

string input = "ŠĐĆŽ šđčćž";
string decomposed = input.Normalize(NormalizationForm.FormD);
char[] filtered = decomposed
    .Where(c => char.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
    .ToArray();
string newString = new String(filtered);

Edit: Slight problem! It doesn't work for the Đ. The result is:

SĐCZ sđccz

Solution 2

Jon Skeet mentioned the following code on a newsgroup...

static string RemoveAccents (string input)
{
    string normalized = input.Normalize(NormalizationForm.FormKD);
    Encoding removal = Encoding.GetEncoding(Encoding.ASCII.CodePage,
                                            new EncoderReplacementFallback(""),
                                            new DecoderReplacementFallback(""));
    byte[] bytes = removal.GetBytes(normalized);
    return Encoding.ASCII.GetString(bytes);
}

EDIT

Maybe I am crazy, but I just ran the following...

Dim Input As String = "ŠĐĆŽ-šđčćž"
Dim Builder As New StringBuilder()

For Each Chr As Char In Input
    Builder.Append(Chr)
Next

Console.Write(Builder.ToString())

And the output was SDCZ-sdccz

17,839

ilija veselica

Updated on June 04, 2022

Comments

ilija veselica almost 2 years
I'd like to use this method to create user-friendly URL. Because my site is in Croatian, there are characters that I wouldn't like to strip but replace them with another. For example, this string:

ŠĐĆŽ šđčćž

needs to be:

sdccz-sdccz

So, I would like to make two arrays, one that will contain characters that are to be replaced and other array with replacement characters:
```
string[] character = { "Š", "Đ", "Č", "Ć", "Ž", "š", "đ", "č", "ć", "ž" };
string[] characterReplace = { "s", "d", "c", "c", "z", "s", "d", "c", "c", "z" };
```
Finally, this two arrays should be use in some method that will take string, find matches and replace them. In php I used preg_replace function to deal with this. In C# this doesn't work:
```
s = Regex.Replace(s, character, characterReplace);
```
Would appreciate if someone could help.
- Mark Byers about 14 years
  
  See stackoverflow.com/questions/2393887/…
ilija veselica about 14 years

I get following error: 'string' does not contain a definition for 'Normalise' and no extension method 'Normalise' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference?)
Mark Byers about 14 years

@ile: Apparently there was an error in the solution I copied this from. I have fixed it now. Unfortunately though this method fails for Đ, so either you will have to handle that case specially, or just do it the way you originally suggested.
Mark Byers about 14 years

This removes the Đ completely.
ilija veselica about 14 years

I see... but this is very simple solution and I will use this and use special method to replace Đ and đ. Thanks!
Timothy Baldridge about 14 years

But character arrays are not. Create a character array and modify the values in it.
Josh Stodola about 14 years

@Mark You are right, but see my edit, it is somewhat unbelievable
Ahmad Mageed about 14 years

hmm I tried that VB.NET code locally and I get the original string.
Josh Stodola about 14 years

@Ahmad I bet it is somehow related to localization settings. I must say that I was daunted when it produced the desired output.
user1713059 almost 5 years

This also removes "ł" (polish).
ahaw over 3 years

Id doesn't work for 'ł' and '€' characters