Mongoose regexp not working?

gistfile1.txt

I am using Mongo v2.0.2, and currently on Mongoose v3.6.0.

I have a collection called "Users". Each doc has a String field called "ua", which is NOT indexed - but I tried with an indexed field and the behaviour is the same.

I want to find all the docs that have a ua containing, say, "Safari". So I try to use RegExp queries.

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Directly in Mongo console, everything works fine:

db.users.find( { ua: { $regex: /safari/i } } )
db.users.find( { ua: /safari/i } )

(both return a set of documents)

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But when working through Mongoose, no such luck.
All the following queries return an empty set:

> User.find({ ua: /safari/i }).exec(console.log)
> User.find({ ua: { $regex: /safari/i } } ).exec(console.log)
> User.find().where('ua').regex(/safari/i).exec(console.log)
> User.find().where('ua').regex(new RegExp("safari", "i")).exec(console.log)

What does work is:
> User.find().where('ua').regex("Safari").exec(console.log)
> User.find({ ua: { $regex: "Safari" } } ).exec(console.log)

^ which is great, but I can't pass regexp options so I have to capitalize.