Test empty string in mongodb and pymongo

Question

Here is my data structure.

[{
\"name\": \"David\",
\"lastname\": \"\",
},
{
\"name\": \"Angela\"
}]

\"lastname\" is sometimes present and

Answer 1

You can use a regex query:

db.test.find({ "lastname": /(.|\s)*\S(.|\s)*/ })

This regex matches strings beginning or ending with 0 or N whitespaces (.|\s) and it have to be one or more non-whitespaces \S in the middle.