Mongodb:我可以比较一个字段中的值是否包含在另一个字段中吗

db.collection.find({ field1: { $regex: field2 } })

{ "_id": 1, "name": "John Doe", "email": "john@example.com" }
{ "_id": 2, "name": "Jane Smith", "email": "jane@example.com" }
{ "_id": 3, "name": "Bob Johnson", "email": "bob@example.com" }

db.users.find({ email: { $regex: "$name" } })

{ "_id": 1, "name": "John Doe", "email": "john@example.com" }
{ "_id": 2, "name": "Jane Smith", "email": "jane@example.com" }