[{"numbers":[{"number":"42312312"},{"number":"22312312"}]},{"numbers":[{"number":"12312312"},{"number":"22312312"}]}]

db.collection.aggregate([{$match:{"numbers.number":{$regex:"^4"}}},{$project:{"numbers":1}},{$match:{"numbers.number":{"$gte":"40000000","$lt":"50000000"}}}])