java - Mongo can't find document while using regex with backslash and & character -

i'm using java mongo find document in database. i'm using following code:

criteria.where(fieldname).regex("astronomy \& astrophysics", "i")

this string "astronomy \& astrophysics" changed in query to:

astronomy \\& astrophysics

there documents in database have fieldname fields equal to:

 astronomy \& astrophysics

but document isn't returned

what java code should use make code work?

for work have escape backslash \

your new code should this

criteria.where(fieldname).regex("astronomy \\& astrophysics", "i")

ITEMscalal