Search by character code in mongoDB

Question

How can I find documents which contains character 0x1F?

{"Description":new RegExp("▼")}

returns 0 results. Also, search for new line character returns 0 results, despite fact that it exists in description of some documents:

{"Description":new RegExp("♪")}

Answer 1

On the Mongo shell, you can do:

db.char.find( { "Description": /\x1F/ } );