Java - mongoDB中带OR的正则表达式

import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

public class MongoDBExample {
    public static void main(String[] args) {
        // 连接到mongoDB数据库
        MongoClient mongoClient = new MongoClient("localhost", 27017);
        MongoDatabase database = mongoClient.getDatabase("mydb");

        // 获取要查询的集合
        MongoCollection<Document> collection = database.getCollection("mycollection");

        // 构建正则表达式模式
        Pattern pattern1 = Pattern.compile("pattern1");
        Pattern pattern2 = Pattern.compile("pattern2");

        // 构建OR查询条件
        List<Document> orConditions = new ArrayList<>();
        orConditions.add(new Document("field1", pattern1));
        orConditions.add(new Document("field2", pattern2));

        // 构建查询条件
        Document query = new Document("$or", orConditions);

        // 执行查询
        MongoCursor<Document> cursor = collection.find(query).iterator();

        // 遍历结果
        while (cursor.hasNext()) {
            Document document = cursor.next();
            System.out.println(document.toJson());
        }

        // 关闭连接
        mongoClient.close();
    }
}