Using the regular expression search syntax on an number/integer field does not return expected results. This may well be the correct behavior. I suppose I assume that Mongo stores and queries all fields as if they were strings, which I do not believe is the case. However, it would be nice if you are doing a regular expression query on a number field, it returned results as if it were a string.

Example:
Sample document:

{ "_id" : ObjectId("4bc3a418091c351776000016"), "request_method" : "get", "request_uri" : "/patients/359/documents", "request_time" : "Mon Apr 12 2010 15:52:08 GMT-0700 (PDT)", "status" : 200 }

Query that returns no results: db.collection.find(

{status: /200/}

)

However, if the status field were stored as a string, then the above query would return results:

{ "_id" : ObjectId("4bc3a418091c351776000016"), "request_method" : "get", "request_uri" : "/patients/359/documents", "request_time" : "Mon Apr 12 2010 15:52:08 GMT-0700 (PDT)", "status" : "200" }