Character replacement during indexing Leave feedback
Character replacement during indexing can be used, for example, to convert all text to lowercase characters or to remove diacritics from text. Such replacements can reduce the size of an index on disk if the case of characters or diacritics are not significant. See also Character replacements page in the Managing dictionaries section.
The example below demonstrates how to configure and use character replacements during indexing.
String indexFolder = "c:\\MyIndex\\";
String documentFolder = "c:\\MyDocuments\\";
// Enabling character replacements in the index settings
IndexSettings settings = new IndexSettings();
settings.setUseCharacterReplacements(true);
// Creating an index in the specified folder
Index index = new Index(indexFolder, settings);
// Configuring character replacements
// Deleting all existing character replacements from the dictionary
index.getDictionaries().getCharacterReplacements().clear();
// Creating new character replacements
CharacterReplacementPair[] characterReplacements = new CharacterReplacementPair[Character.MAX_VALUE + 1];
for (int i = 0; i < characterReplacements.length; i++)
{
char character = (char)i;
char replacement = Character.toLowerCase(character);
characterReplacements[i] = new CharacterReplacementPair(character, replacement);
}
// Adding character replacements to the dictionary
index.getDictionaries().getCharacterReplacements().addRange(characterReplacements);
// Indexing documents from the specified folder
index.add(documentFolder);
// Searching in the index
// Case-sensitive search is no longer possible for this index, since all characters are lowercase
// By default, case-insensitive search is performed
SearchResult result = index.search("Einstein");
You may easily run the code from documentation articles and see the features in action in our GitHub examples:
Along with full featured .NET library we provide simple, but powerful free Apps.
You are welcome to search over your PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX and more with our free online Free Online Document Search App.
Was this page helpful?
Any additional feedback you'd like to share with us?
Please tell us how we can improve this page.
Thank you for your feedback!
We value your opinion. Your feedback will help us improve our documentation.
