public MongoDBSourceBuilder<T> databaseList(String... databases) {
        for (String database : databases) {
            this.configFactory.databaseList(database.split(","));
        }
        return this;
    }
Regular expressions list that match database names to be monitored.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mongodb-cdc/src/main/java/org/apache/inlong/sort/cdc/mongodb/source/MongoDBSourceBuilder.java