Use @Query annotation in Spring Data MongoDB

With this annotation, we can specify a raw query as a Mongo JSON query string.

FindBy

@Query("{ 'name' : ?0 }")
List<User> findUsersByName(String name);

List<User> users = userRepository.findUsersByName("Eric");

$regex

@Query("{ 'name' : { $regex: ?0 } }")
List<User> findUsersByRegexpName(String regexp);

List<User> users = userRepository.findUsersByRegexpName("^A");

List<User> users = userRepository.findUsersByRegexpName("c$");

$lt and $gt

@Query("{ 'age' : { $gt: ?0, $lt: ?1 } }")
List<User> findUsersByAgeBetween(int ageGT, int ageLT);

List<User> users = userRepository.findUsersByAgeBetween(20, 50);

References
https://www.baeldung.com/queries-in-spring-data-mongodb