i'm having trouble getting mongodb to recognize my regular expression. i'm trying to list documents(tweets) where user.screen_name starts with an n

mongodb regexp help

output

121980
--------- tweets from neilkod -------
neilkod
neilkod
neilkod
neilkod
neilkod
---------tweets from users that start with n--------
-----done------


def regexpTest():
	tweets = createConnection()
	theCount = tweets.count()
	print theCount
	print "--------- tweets from neilkod -------"
	cur = tweets.find({'user.screen_name':'neilkod'},{'user.screen_name':1})
	for v in cur:
		print v['user']['screen_name']
	print "---------tweets from users that start with n--------"
	cur = tweets.find({'user.screen_name':'/^n.*/'},{'user.screen_name':1})
	for v in cur:
		print v['user']['screen_name']
	print "-----done------"

example document:

> db.tweets.findOne()
{
	"_id" : ObjectId("4cdd49080e37707a39caa92c"),
	"retweeted_status" : {
		"geo" : null,
		"retweet_count" : null,
		"in_reply_to_status_id" : null,
		"text" : "Last chance to get #RavenHunt poker coin at #PubCon today: I'll be outside Salon C at 4:10. Clue No. 1 to follow again on Twitter.",
		"entities" : {
			"hashtags" : [
				{
					"text" : "RavenHunt",
					"indices" : [
						19,
						29
					]
				},
				{
					"text" : "PubCon",
					"indices" : [
						44,
						51
					]
				}
			],
			"urls" : [ ],
			"user_mentions" : [ ]
		},
		"retweeted" : false,
		"place" : null,
		"in_reply_to_user_id" : null,
		"in_reply_to_status_id_str" : null,
		"coordinates" : null,
		"source" : "<a href=\"http://itunes.apple.com/app/twitter/id333903271?mt=8\" rel=\"nofollow\">Twitter for iPad</a>",
		"truncated" : false,
		"in_reply_to_user_id_str" : null,
		"id_str" : "2147676590182400",
		"favorited" : false,
		"created_at" : "Tue Nov 09 23:57:00 +0000 2010",
		"contributors" : null,
		"user" : {
			"lang" : "en",
			"profile_background_image_url" : "http://a1.twimg.com/profile_background_images/149836964/twitterbackground2.jpg",
			"following" : null,
			"notifications" : null,
			"favourites_count" : 2,
			"listed_count" : 20,
			"profile_background_tile" : false,
			"profile_background_color" : "ffffff",
			"statuses_count" : 463,
			"description" : "Communications Director at Raven Internet Marketing Tools. Factoid junkie, middle child, past-life journo. When you use utilize incorrectly, God kills a kitten.",
			"show_all_inline_media" : false,
			"profile_use_background_image" : true,
			"profile_text_color" : "333333",
			"contributors_enabled" : false,
			"location" : "Nashville, TN",
			"id_str" : "172055179",
			"geo_enabled" : true,
			"profile_link_color" : "3e7994",
			"followers_count" : 293,
			"friends_count" : 366,
			"protected" : false,
			"profile_image_url" : "http://a3.twimg.com/profile_images/1112291963/arienne-holland3_normal.jpg",
			"verified" : false,
			"created_at" : "Wed Jul 28 20:19:42 +0000 2010",
			"profile_sidebar_fill_color" : "e0e0e0",
			"name" : "Arienne Holland",
			"follow_request_sent" : null,
			"time_zone" : "Central Time (US & Canada)",
			"url" : "http://raventools.com",
			"screen_name" : "RavenArienne",
			"id" : 172055179,
			"utc_offset" : -21600,
			"profile_sidebar_border_color" : "ffffff"
		},
		"in_reply_to_screen_name" : null,
		"id" : NumberLong("2147676590182400")
	},
	"geo" : null,
	"retweet_count" : null,
	"in_reply_to_status_id" : null,
	"text" : "RT @RavenArienne: Last chance to get #RavenHunt poker coin at #PubCon today: I'll be outside Salon C at 4:10. Clue No. 1 to follow again ...",
	"new_id_str" : "2148451106160640",
	"entities" : {
		"hashtags" : [
			{
				"text" : "RavenHunt",
				"indices" : [
					37,
					47
				]
			},
			{
				"text" : "PubCon",
				"indices" : [
					62,
					69
				]
			}
		],
		"urls" : [ ],
		"user_mentions" : [
			{
				"indices" : [
					3,
					16
				],
				"id_str" : "172055179",
				"name" : "Arienne Holland",
				"screen_name" : "RavenArienne",
				"id" : 172055179
			}
		]
	},
	"retweeted" : false,
	"place" : null,
	"in_reply_to_user_id" : null,
	"in_reply_to_status_id_str" : null,
	"coordinates" : null,
	"source" : "<a href=\"http://www.tweetdeck.com\" rel=\"nofollow\">TweetDeck</a>",
	"new_id" : NumberLong("2148451106160640"),
	"truncated" : true,
	"in_reply_to_user_id_str" : null,
	"id_str" : "2148451106160640",
	"favorited" : false,
	"created_at" : "Wed Nov 10 00:00:05 +0000 2010",
	"contributors" : null,
	"user" : {
		"lang" : "en",
		"profile_background_image_url" : "http://a1.twimg.com/profile_background_images/88502652/twilk_background_4bb63d5b40aea.jpg",
		"following" : null,
		"notifications" : null,
		"favourites_count" : 13,
		"listed_count" : 15,
		"profile_background_tile" : true,
		"profile_background_color" : "9ae4e8",
		"statuses_count" : 3009,
		"description" : "search engine marketing; digital marketing strategies; wine enthusiast; soccer fan; travel; education",
		"show_all_inline_media" : false,
		"profile_use_background_image" : true,
		"profile_text_color" : "000000",
		"contributors_enabled" : false,
		"location" : "Portland",
		"id_str" : "16107612",
		"geo_enabled" : true,
		"profile_link_color" : "0000ff",
		"followers_count" : 569,
		"friends_count" : 710,
		"protected" : false,
		"profile_image_url" : "http://a2.twimg.com/profile_images/1157439518/pic2_normal.jpg",
		"verified" : false,
		"created_at" : "Wed Sep 03 03:06:28 +0000 2008",
		"profile_sidebar_fill_color" : "e0ff92",
		"name" : "Trish Carey",
		"follow_request_sent" : null,
		"time_zone" : "Pacific Time (US & Canada)",
		"url" : "http://www.facebook.com/careytn",
		"screen_name" : "TrishCarey",
		"id" : 16107612,
		"utc_offset" : -28800,
		"profile_sidebar_border_color" : "87bc44"
	},
	"in_reply_to_screen_name" : null,
	"id" : NumberLong("2148451106160640")
}