In operators for query builders and Linq extension should take regular expressions as arguments when the operator is a string.

Original report:
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Could you please verify if there is an option to build a linq query equivalent to the mongo query:

db.Feeds.find({ShortDescription:{$in:[/sunil/, /raj/]}})

I have tried:
MongoCollection<BsonDocument> feedscollection = _db.database.GetCollection<BsonDocument>("Feeds");
var feeds = (from f in feedscollection.AsQueryable<Feeds>()
select f);
string tags="1)Lorem ipsum sunil dolor sit amet, 2)Maecenas raj pretium laoreet nibh, 3)a rhoncus turpis cursus gravida";
var searchwordlist = tags.ToLower().Split(new char[]

, StringSplitOptions.RemoveEmptyEntries).Select(s => string.Format("/

/", s)).ToList();
feeds = feeds.Where(f => f.ShortDescription.In(searchwordlist));
//With the mongo query I am getting the first and second sentence. But when I go with the linq -> mongo query, I am not getting any results.