Document filtering in search result Leave feedback
This page contains a description of the document filters used during the search.
To specify which of the documents found should be returned as a result of the search, the setSearchDocumentFilter method of the SearchOptions class is used. If the document found does not match a filter passed to this method as an argument, the document will not be returned. The default value is null, which means that all documents found will be returned. The following example shows how to set a document filter for searching.
const indexFolder = 'c:/MyIndex/';
const documentsFolder = 'c:/MyDocuments/';
// Creating an index in the specified folder
const index = new groupdocs.search.Index(indexFolder);
// Indexing documents from the specified folder
index.add(documentsFolder);
// Creating a search options object
const options = new groupdocs.search.SearchOptions();
options.setSearchDocumentFilter(groupdocs.search.SearchDocumentFilter.createFileExtension('.txt')); // Setting a document filter
// Search in the index
// Only text documents will be returned as the result of the search
const query = 'education';
const result = index.search(query, options);
The first supported type of search document filters allows you to set a regular expression for getting those documents whose full paths match the specified pattern. This type of filters uses the java.util.regex.Pattern class to compare with a pattern.
// The filter returns only files that contain the word 'Lorem' in their paths, not case sensitive
const filter = groupdocs.search.SearchDocumentFilter.createFilePathRegularExpression(
'Lorem',
java.getStaticFieldValue('java.util.regex.Pattern', 'CASE_INSENSITIVE'),
);
The next supported type of search document filters allows you to specify a list of valid file extensions for indexing.
// This filter returns only PDF and DOCX documents
const filter = groupdocs.search.SearchDocumentFilter.createFileExtension('.pdf', '.docx');
The next supported type of search document filters allows you to search only those documents with which the specified text attribute is associated. You can learn more about attributes on the Document attributes page.
// This filter returns only documents that have attribute "main"
const filter = groupdocs.search.SearchDocumentFilter.createAttribute('main');
Search document filters can be combined using composite filters AND, OR, NOT. The following example shows how to combine search document filters.
// Creating an AND composite filter that returns all FB2 and EPUB documents that have the word 'Einstein' in their full paths
const filter1 = groupdocs.search.SearchDocumentFilter.createFilePathRegularExpression(
'Einstein',
java.getStaticFieldValue('java.util.regex.Pattern', 'CASE_INSENSITIVE'),
);
const filter2 = groupdocs.search.SearchDocumentFilter.createFileExtension('.fb2', '.epub');
const andFilter = groupdocs.search.SearchDocumentFilter.createAnd(filter1, filter2);
// Creating an OR composite filter that returns all DOC, DOCX, PDF and all documents that have the word Einstein in their full paths
const filter3 = groupdocs.search.SearchDocumentFilter.createFilePathRegularExpression(
'Einstein',
java.getStaticFieldValue('java.util.regex.Pattern', 'CASE_INSENSITIVE'),
);
const filter4 = groupdocs.search.SearchDocumentFilter.createFileExtension('.doc', '.docx', '.pdf');
const orFilter = groupdocs.search.SearchDocumentFilter.createOr(filter3, filter4);
// Creating a filter that returns all found documents except of TXT documents
const filter5 = groupdocs.search.SearchDocumentFilter.createFileExtension('.txt');
const notFilter = groupdocs.search.SearchDocumentFilter.createNot(filter5);
You may easily run the code from documentation articles and see the features in action in our GitHub examples:
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