query with like in mongodb from using node js

how can I do a like query in mongodb using nodejs:

here is my source code code, but it doesn't work:

exports.findAll = function(req, res) {
    var country=req.params.country; 
    db.collection('wines', function(err, collection) {
        collection.find({ 'country': new RegExp('/'+country+'/i') }).toArray(function(err, items) {
            res.jsonp(items);
        });
    });
};

I solved like this:

 exports.findAll = function(req, res) {
        var country=req.params.country; 
        db.collection('wines', function(err, collection) {
            collection.find({ 'country': new RegExp(country, 'i') }).toArray(function(err, items) {
                res.jsonp(items);
            });
        });
    };