> ## Documentation Index
> Fetch the complete documentation index at: https://algolia.com/llms.txt
> Use this file to discover all available pages before exploring further.

# keepDiacriticsOnCharacters

> Characters to exclude from diacritic normalization

export const Setting = ({type, default: defaultValue, defaultNote, scope, min, max, formerly}) => {
  const renderedDefault = defaultValue === '' ? '""' : defaultValue;
  const renderedNote = defaultNote ? `(${defaultNote})` : '';
  return <ul>
      <li><strong>Type:</strong> <code>{type}</code></li>
      <li><strong>Default:</strong> <code>{renderedDefault}</code>{renderedNote}</li>
      {min && <li><strong>Min:</strong> <code>{min}</code></li>}
      {max && <li><strong>Max:</strong> <code>{max}</code></li>}
      <li><strong>Scope:</strong> <a href="/doc/api-reference/api-parameters"><code>{scope}</code></a></li>
      {formerly && <li>
          <strong>Deprecated name:</strong> <code>{formerly}</code>
        </li>}
    </ul>;
};

<Setting type="string" default="" scope="settings" />

The `keepDiacriticsOnCharacters` parameter lets you preserve specific characters with diacritics.
By default, Algolia removes diacritics: `"é"` becomes `"e"`, `"ø"` becomes `"o"`, and `"で"` becomes `"て"`.
Use this setting to protect selected characters from being transformed.

## Usage

* Only lowercase characters are accepted.
  For example, to preserve both `"ø"` and `"Ø"`, include only `"ø"`.
* Only characters that are normally transformed are allowed.
  Characters without diacritics, such as `"o"`, aren't valid.
* This doesn't affect characters built from combining marks.
  For example:
  * `ü` (U+00FC) can be preserved.
  * `ü` (U+0075 + U+0308) will still be normalized.

## Example

<AccordionGroup>
  <Accordion title="Current API clients" defaultOpen="true">
    <CodeGroup>
      ```cs C# theme={"system"}
      var response = await client.SetSettingsAsync(
        "INDEX_NAME",
        new IndexSettings { KeepDiacriticsOnCharacters = "øé" }
      );
      ```

      ```dart Dart theme={"system"}
      final response = await client.setSettings(
        indexName: "INDEX_NAME",
        indexSettings: IndexSettings(
          keepDiacriticsOnCharacters: "øé",
        ),
      );
      ```

      ```go Go theme={"system"}
      response, err := client.SetSettings(client.NewApiSetSettingsRequest(
        "INDEX_NAME",
        search.NewEmptyIndexSettings().SetKeepDiacriticsOnCharacters("øé")))
      if err != nil {
        // handle the eventual error
        panic(err)
      }
      ```

      ```java Java theme={"system"}
      UpdatedAtResponse response = client.setSettings("INDEX_NAME", new IndexSettings().setKeepDiacriticsOnCharacters("øé"));
      ```

      ```js JavaScript theme={"system"}
      const response = await client.setSettings({
        indexName: 'theIndexName',
        indexSettings: { keepDiacriticsOnCharacters: 'øé' },
      });
      ```

      ```kotlin Kotlin theme={"system"}
      var response =
        client.setSettings(
          indexName = "INDEX_NAME",
          indexSettings = IndexSettings(keepDiacriticsOnCharacters = "øé"),
        )
      ```

      ```php PHP theme={"system"}
      $response = $client->setSettings(
          'INDEX_NAME',
          ['keepDiacriticsOnCharacters' => 'øé',
          ],
      );
      ```

      ```python Python theme={"system"}
      response = client.set_settings(
          index_name="INDEX_NAME",
          index_settings={
              "keepDiacriticsOnCharacters": "øé",
          },
      )
      ```

      ```ruby Ruby theme={"system"}
      response = client.set_settings(
        "INDEX_NAME",
        Algolia::Search::IndexSettings.new(keep_diacritics_on_characters: "øé")
      )
      ```

      ```scala Scala theme={"system"}
      val response = Await.result(
        client.setSettings(
          indexName = "INDEX_NAME",
          indexSettings = IndexSettings(
            keepDiacriticsOnCharacters = Some("øé")
          )
        ),
        Duration(100, "sec")
      )
      ```

      ```swift Swift theme={"system"}
      let response = try await client.setSettings(
          indexName: "INDEX_NAME",
          indexSettings: IndexSettings(keepDiacriticsOnCharacters: "øé")
      )
      ```
    </CodeGroup>
  </Accordion>

  <Accordion title="Legacy API clients">
    <CodeGroup>
      ```cs C# theme={"system"}
      IndexSettings settings = new IndexSettings();
      settings.KeepDiacriticsOnCharacters = "øé";

      index.SetSettings(settings);
      ```

      ```go Go theme={"system"}
      res, err := index.SetSettings(search.Settings{
      	KeepDiacriticsOnCharacters: opt.KeepDiacriticsOnCharacters("øé"),
      })
      ```

      ```java Java theme={"system"}
      index.setSettings(
        new IndexSettings()
          .setKeepDiacriticsOnCharacters("øé")
      );
      ```

      ```js JavaScript theme={"system"}
      index
        .setSettings({
          keepDiacriticsOnCharacters: "øé",
        })
        .then(() => {
          // done
        });
      ```

      ```kotlin Kotlin theme={"system"}
      val settings = settings {
          keepDiacriticsOnCharacters = "øé"
      }

      index.setSettings(settings)
      ```

      ```php PHP theme={"system"}
      $index->setSettings([
        'keepDiacriticsOnCharacters' => 'øé'
      ]);
      ```

      ```python Python theme={"system"}
      index.set_settings({"keepDiacriticsOnCharacters": "øé"})
      ```

      ```ruby Ruby theme={"system"}
      index.set_settings(
        {
          keepDiacriticsOnCharacters: "øé"
        }
      )
      ```

      ```scala Scala theme={"system"}
      client.execute {
        setSettings of "myIndex" `with` IndexSettings(
          keepDiacriticsOnCharacters = Some("øé")
        )
      }
      ```

      ```swift Swift theme={"system"}
      let settings = Settings()
        .set(\.keepDiacriticsOnCharacters, to: "øé")

      index.setSettings(settings) { result in
        if case .success(let response) = result {
          print("Response: \(response)")
        }
      }
      ```
    </CodeGroup>
  </Accordion>
</AccordionGroup>