diff --git a/youtube_dl/extractor/addanime.py b/youtube_dl/extractor/addanime.py
index b99d4b9668..a3a1b999df 100644
--- a/youtube_dl/extractor/addanime.py
+++ b/youtube_dl/extractor/addanime.py
@@ -13,7 +13,7 @@ from ..utils import (
 
 class AddAnimeIE(InfoExtractor):
 
-    _VALID_URL = r'^http://(?:\w+\.)?add-anime\.net/watch_video.php\?(?:.*?)v=(?P<video_id>[\w_]+)(?:.*)'
+    _VALID_URL = r'^http://(?:\w+\.)?add-anime\.net/watch_video\.php\?(?:.*?)v=(?P<video_id>[\w_]+)(?:.*)'
     IE_NAME = u'AddAnime'
     _TEST = {
         u'url': u'http://www.add-anime.net/watch_video.php?v=24MR3YO5SAS9',
diff --git a/youtube_dl/extractor/appletrailers.py b/youtube_dl/extractor/appletrailers.py
index 4befff3942..a527f10de2 100644
--- a/youtube_dl/extractor/appletrailers.py
+++ b/youtube_dl/extractor/appletrailers.py
@@ -10,7 +10,7 @@ from ..utils import (
 
 
 class AppleTrailersIE(InfoExtractor):
-    _VALID_URL = r'https?://(?:www\.)?trailers.apple.com/trailers/(?P<company>[^/]+)/(?P<movie>[^/]+)'
+    _VALID_URL = r'https?://(?:www\.)?trailers\.apple\.com/trailers/(?P<company>[^/]+)/(?P<movie>[^/]+)'
     _TEST = {
         u"url": u"http://trailers.apple.com/trailers/wb/manofsteel/",
         u"playlist": [
diff --git a/youtube_dl/extractor/archiveorg.py b/youtube_dl/extractor/archiveorg.py
index 3ae0aebb12..8bb546410f 100644
--- a/youtube_dl/extractor/archiveorg.py
+++ b/youtube_dl/extractor/archiveorg.py
@@ -11,7 +11,7 @@ from ..utils import (
 class ArchiveOrgIE(InfoExtractor):
     IE_NAME = 'archive.org'
     IE_DESC = 'archive.org videos'
-    _VALID_URL = r'(?:https?://)?(?:www\.)?archive.org/details/(?P<id>[^?/]+)(?:[?].*)?$'
+    _VALID_URL = r'(?:https?://)?(?:www\.)?archive\.org/details/(?P<id>[^?/]+)(?:[?].*)?$'
     _TEST = {
         u"url": u"http://archive.org/details/XD300-23_68HighlightsAResearchCntAugHumanIntellect",
         u'file': u'XD300-23_68HighlightsAResearchCntAugHumanIntellect.ogv',
diff --git a/youtube_dl/extractor/arte.py b/youtube_dl/extractor/arte.py
index 8b62ee774c..56a5d009fc 100644
--- a/youtube_dl/extractor/arte.py
+++ b/youtube_dl/extractor/arte.py
@@ -17,8 +17,8 @@ from ..utils import (
 # add tests.
 
 class ArteTvIE(InfoExtractor):
-    _VIDEOS_URL = r'(?:http://)?videos.arte.tv/(?P<lang>fr|de)/.*-(?P<id>.*?).html'
-    _LIVEWEB_URL = r'(?:http://)?liveweb.arte.tv/(?P<lang>fr|de)/(?P<subpage>.+?)/(?P<name>.+)'
+    _VIDEOS_URL = r'(?:http://)?videos\.arte\.tv/(?P<lang>fr|de)/.*-(?P<id>.*?)\.html'
+    _LIVEWEB_URL = r'(?:http://)?liveweb\.arte\.tv/(?P<lang>fr|de)/(?P<subpage>.+?)/(?P<name>.+)'
     _LIVE_URL = r'index-[0-9]+\.html$'
 
     IE_NAME = u'arte.tv'
diff --git a/youtube_dl/extractor/auengine.py b/youtube_dl/extractor/auengine.py
index 95c038003b..bcccc0b7a5 100644
--- a/youtube_dl/extractor/auengine.py
+++ b/youtube_dl/extractor/auengine.py
@@ -16,7 +16,7 @@ class AUEngineIE(InfoExtractor):
             u"title": u"[Commie]The Legend of the Legendary Heroes - 03 - Replication Eye (Alpha Stigma)[F9410F5A]"
         }
     }
-    _VALID_URL = r'(?:http://)?(?:www\.)?auengine\.com/embed.php\?.*?file=([^&]+).*?'
+    _VALID_URL = r'(?:http://)?(?:www\.)?auengine\.com/embed\.php\?.*?file=([^&]+).*?'
 
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
diff --git a/youtube_dl/extractor/bambuser.py b/youtube_dl/extractor/bambuser.py
index b80508efed..d48c0c38d0 100644
--- a/youtube_dl/extractor/bambuser.py
+++ b/youtube_dl/extractor/bambuser.py
@@ -54,7 +54,7 @@ class BambuserIE(InfoExtractor):
 
 class BambuserChannelIE(InfoExtractor):
     IE_NAME = u'bambuser:channel'
-    _VALID_URL = r'http://bambuser.com/channel/(?P<user>.*?)(?:/|#|\?|$)'
+    _VALID_URL = r'https?://bambuser\.com/channel/(?P<user>.*?)(?:/|#|\?|$)'
     # The maximum number we can get with each request
     _STEP = 50
 
diff --git a/youtube_dl/extractor/bloomberg.py b/youtube_dl/extractor/bloomberg.py
index 3666a780b9..755d9c9ef2 100644
--- a/youtube_dl/extractor/bloomberg.py
+++ b/youtube_dl/extractor/bloomberg.py
@@ -4,7 +4,7 @@ from .common import InfoExtractor
 
 
 class BloombergIE(InfoExtractor):
-    _VALID_URL = r'https?://www\.bloomberg\.com/video/(?P<name>.+?).html'
+    _VALID_URL = r'https?://www\.bloomberg\.com/video/(?P<name>.+?)\.html'
 
     _TEST = {
         u'url': u'http://www.bloomberg.com/video/shah-s-presentation-on-foreign-exchange-strategies-qurhIVlJSB6hzkVi229d8g.html',
diff --git a/youtube_dl/extractor/comedycentral.py b/youtube_dl/extractor/comedycentral.py
index 53579aa270..a54ce3ee7c 100644
--- a/youtube_dl/extractor/comedycentral.py
+++ b/youtube_dl/extractor/comedycentral.py
@@ -12,7 +12,7 @@ from ..utils import (
 
 
 class ComedyCentralIE(MTVServicesInfoExtractor):
-    _VALID_URL = r'http://www.comedycentral.com/(video-clips|episodes|cc-studios)/(?P<title>.*)'
+    _VALID_URL = r'https?://(?:www.)?comedycentral.com/(video-clips|episodes|cc-studios)/(?P<title>.*)'
     _FEED_URL = u'http://comedycentral.com/feeds/mrss/'
 
     _TEST = {
diff --git a/youtube_dl/extractor/cspan.py b/youtube_dl/extractor/cspan.py
index 7bf03c584c..d5730684dc 100644
--- a/youtube_dl/extractor/cspan.py
+++ b/youtube_dl/extractor/cspan.py
@@ -6,7 +6,7 @@ from ..utils import (
 )
 
 class CSpanIE(InfoExtractor):
-    _VALID_URL = r'http://www.c-spanvideo.org/program/(.*)'
+    _VALID_URL = r'http://www\.c-spanvideo\.org/program/(.*)'
     _TEST = {
         u'url': u'http://www.c-spanvideo.org/program/HolderonV',
         u'file': u'315139.flv',
diff --git a/youtube_dl/extractor/dreisat.py b/youtube_dl/extractor/dreisat.py
index 24ce794255..cb7226f82a 100644
--- a/youtube_dl/extractor/dreisat.py
+++ b/youtube_dl/extractor/dreisat.py
@@ -11,7 +11,7 @@ from ..utils import (
 
 class DreiSatIE(InfoExtractor):
     IE_NAME = '3sat'
-    _VALID_URL = r'(?:http://)?(?:www\.)?3sat.de/mediathek/index.php\?(?:(?:mode|display)=[^&]+&)*obj=(?P<id>[0-9]+)$'
+    _VALID_URL = r'(?:http://)?(?:www\.)?3sat\.de/mediathek/index\.php\?(?:(?:mode|display)=[^&]+&)*obj=(?P<id>[0-9]+)$'
     _TEST = {
         u"url": u"http://www.3sat.de/mediathek/index.php?obj=36983",
         u'file': u'36983.webm',
diff --git a/youtube_dl/extractor/eighttracks.py b/youtube_dl/extractor/eighttracks.py
index f21ef88530..88f5526b8a 100644
--- a/youtube_dl/extractor/eighttracks.py
+++ b/youtube_dl/extractor/eighttracks.py
@@ -10,7 +10,7 @@ from ..utils import (
 
 class EightTracksIE(InfoExtractor):
     IE_NAME = '8tracks'
-    _VALID_URL = r'https?://8tracks.com/(?P<user>[^/]+)/(?P<id>[^/#]+)(?:#.*)?$'
+    _VALID_URL = r'https?://8tracks\.com/(?P<user>[^/]+)/(?P<id>[^/#]+)(?:#.*)?$'
     _TEST = {
         u"name": u"EightTracks",
         u"url": u"http://8tracks.com/ytdl/youtube-dl-test-tracks-a",
diff --git a/youtube_dl/extractor/exfm.py b/youtube_dl/extractor/exfm.py
index a51d79b08c..682901d162 100644
--- a/youtube_dl/extractor/exfm.py
+++ b/youtube_dl/extractor/exfm.py
@@ -8,7 +8,7 @@ class ExfmIE(InfoExtractor):
     IE_NAME = u'exfm'
     IE_DESC = u'ex.fm'
     _VALID_URL = r'(?:http://)?(?:www\.)?ex\.fm/song/([^/]+)'
-    _SOUNDCLOUD_URL = r'(?:http://)?(?:www\.)?api\.soundcloud.com/tracks/([^/]+)/stream'
+    _SOUNDCLOUD_URL = r'(?:http://)?(?:www\.)?api\.soundcloud\.com/tracks/([^/]+)/stream'
     _TESTS = [
         {
             u'url': u'http://ex.fm/song/eh359',
diff --git a/youtube_dl/extractor/faz.py b/youtube_dl/extractor/faz.py
index d0dfde694b..c6ab6952e8 100644
--- a/youtube_dl/extractor/faz.py
+++ b/youtube_dl/extractor/faz.py
@@ -9,7 +9,7 @@ from ..utils import (
 
 class FazIE(InfoExtractor):
     IE_NAME = u'faz.net'
-    _VALID_URL = r'https?://www\.faz\.net/multimedia/videos/.*?-(?P<id>\d+).html'
+    _VALID_URL = r'https?://www\.faz\.net/multimedia/videos/.*?-(?P<id>\d+)\.html'
 
     _TEST = {
         u'url': u'http://www.faz.net/multimedia/videos/stockholm-chemie-nobelpreis-fuer-drei-amerikanische-forscher-12610585.html',
diff --git a/youtube_dl/extractor/fktv.py b/youtube_dl/extractor/fktv.py
index dba1a8dc26..d7048c8c1a 100644
--- a/youtube_dl/extractor/fktv.py
+++ b/youtube_dl/extractor/fktv.py
@@ -12,7 +12,7 @@ from ..utils import (
 
 class FKTVIE(InfoExtractor):
     IE_NAME = u'fernsehkritik.tv'
-    _VALID_URL = r'(?:http://)?(?:www\.)?fernsehkritik.tv/folge-(?P<ep>[0-9]+)(?:/.*)?'
+    _VALID_URL = r'(?:http://)?(?:www\.)?fernsehkritik\.tv/folge-(?P<ep>[0-9]+)(?:/.*)?'
 
     _TEST = {
         u'url': u'http://fernsehkritik.tv/folge-1',
@@ -52,7 +52,7 @@ class FKTVIE(InfoExtractor):
 
 class FKTVPosteckeIE(InfoExtractor):
     IE_NAME = u'fernsehkritik.tv:postecke'
-    _VALID_URL = r'(?:http://)?(?:www\.)?fernsehkritik.tv/inline-video/postecke.php\?(.*&)?ep=(?P<ep>[0-9]+)(&|$)'
+    _VALID_URL = r'(?:http://)?(?:www\.)?fernsehkritik\.tv/inline-video/postecke\.php\?(.*&)?ep=(?P<ep>[0-9]+)(&|$)'
     _TEST = {
         u'url': u'http://fernsehkritik.tv/inline-video/postecke.php?iframe=true&width=625&height=440&ep=120',
         u'file': u'0120.flv',
diff --git a/youtube_dl/extractor/francetv.py b/youtube_dl/extractor/francetv.py
index 6e1971043b..66aa3aa0d0 100644
--- a/youtube_dl/extractor/francetv.py
+++ b/youtube_dl/extractor/francetv.py
@@ -45,7 +45,7 @@ class PluzzIE(FranceTVBaseInfoExtractor):
 
 class FranceTvInfoIE(FranceTVBaseInfoExtractor):
     IE_NAME = u'francetvinfo.fr'
-    _VALID_URL = r'https?://www\.francetvinfo\.fr/replay.*/(?P<title>.+).html'
+    _VALID_URL = r'https?://www\.francetvinfo\.fr/replay.*/(?P<title>.+)\.html'
 
     _TEST = {
         u'url': u'http://www.francetvinfo.fr/replay-jt/france-3/soir-3/jt-grand-soir-3-lundi-26-aout-2013_393427.html',
diff --git a/youtube_dl/extractor/gamekings.py b/youtube_dl/extractor/gamekings.py
index c91669b0eb..a3a5251fe5 100644
--- a/youtube_dl/extractor/gamekings.py
+++ b/youtube_dl/extractor/gamekings.py
@@ -4,7 +4,7 @@ from .common import InfoExtractor
 
 
 class GamekingsIE(InfoExtractor):
-    _VALID_URL = r'http?://www\.gamekings\.tv/videos/(?P<name>[0-9a-z\-]+)'
+    _VALID_URL = r'http://www\.gamekings\.tv/videos/(?P<name>[0-9a-z\-]+)'
     _TEST = {
         u"url": u"http://www.gamekings.tv/videos/phoenix-wright-ace-attorney-dual-destinies-review/",
         u'file': u'20130811.mp4',
diff --git a/youtube_dl/extractor/gametrailers.py b/youtube_dl/extractor/gametrailers.py
index 3a8bef250f..d82a5d4b2a 100644
--- a/youtube_dl/extractor/gametrailers.py
+++ b/youtube_dl/extractor/gametrailers.py
@@ -4,8 +4,7 @@ from .mtv import MTVServicesInfoExtractor
 
 
 class GametrailersIE(MTVServicesInfoExtractor):
-    _VALID_URL = r'http://www.gametrailers.com/(?P<type>videos|reviews|full-episodes)/(?P<id>.*?)/(?P<title>.*)'
-
+    _VALID_URL = r'http://www\.gametrailers\.com/(?P<type>videos|reviews|full-episodes)/(?P<id>.*?)/(?P<title>.*)'
     _TEST = {
         u'url': u'http://www.gametrailers.com/videos/zbvr8i/mirror-s-edge-2-e3-2013--debut-trailer',
         u'file': u'70e9a5d7-cf25-4a10-9104-6f3e7342ae0d.mp4',
diff --git a/youtube_dl/extractor/ign.py b/youtube_dl/extractor/ign.py
index c52146f7d7..57b79a3363 100644
--- a/youtube_dl/extractor/ign.py
+++ b/youtube_dl/extractor/ign.py
@@ -103,7 +103,7 @@ class IGNIE(InfoExtractor):
 class OneUPIE(IGNIE):
     """Extractor for 1up.com, it uses the ign videos system."""
 
-    _VALID_URL = r'https?://gamevideos.1up.com/(?P<type>video)/id/(?P<name_or_id>.+)'
+    _VALID_URL = r'https?://gamevideos\.1up\.com/(?P<type>video)/id/(?P<name_or_id>.+)'
     IE_NAME = '1up.com'
 
     _DESCRIPTION_RE = r'<div id="vid_summary">(.+?)</div>'
diff --git a/youtube_dl/extractor/instagram.py b/youtube_dl/extractor/instagram.py
index 213aac4284..660573d022 100644
--- a/youtube_dl/extractor/instagram.py
+++ b/youtube_dl/extractor/instagram.py
@@ -3,7 +3,7 @@ import re
 from .common import InfoExtractor
 
 class InstagramIE(InfoExtractor):
-    _VALID_URL = r'(?:http://)?instagram.com/p/(.*?)/'
+    _VALID_URL = r'(?:http://)?instagram\.com/p/(.*?)/'
     _TEST = {
         u'url': u'http://instagram.com/p/aye83DjauH/?foo=bar#abc',
         u'file': u'aye83DjauH.mp4',
diff --git a/youtube_dl/extractor/jukebox.py b/youtube_dl/extractor/jukebox.py
index c7bb234fe9..592c64e1de 100644
--- a/youtube_dl/extractor/jukebox.py
+++ b/youtube_dl/extractor/jukebox.py
@@ -8,7 +8,7 @@ from ..utils import (
 )
 
 class JukeboxIE(InfoExtractor):
-    _VALID_URL = r'^http://www\.jukebox?\..+?\/.+[,](?P<video_id>[a-z0-9\-]+).html'
+    _VALID_URL = r'^http://www\.jukebox?\..+?\/.+[,](?P<video_id>[a-z0-9\-]+)\.html'
     _IFRAME = r'<iframe .*src="(?P<iframe>[^"]*)".*>'
     _VIDEO_URL = r'"config":{"file":"(?P<video_url>http:[^"]+[.](?P<video_ext>[^.?]+)[?]mdtk=[0-9]+)"'
     _TITLE = r'<h1 class="inline">(?P<title>[^<]+)</h1>.*<span id="infos_article_artist">(?P<artist>[^<]+)</span>'
diff --git a/youtube_dl/extractor/liveleak.py b/youtube_dl/extractor/liveleak.py
index dd062a14e7..5ae57a77c6 100644
--- a/youtube_dl/extractor/liveleak.py
+++ b/youtube_dl/extractor/liveleak.py
@@ -8,7 +8,7 @@ from ..utils import (
 
 class LiveLeakIE(InfoExtractor):
 
-    _VALID_URL = r'^(?:http?://)?(?:\w+\.)?liveleak\.com/view\?(?:.*?)i=(?P<video_id>[\w_]+)(?:.*)'
+    _VALID_URL = r'^(?:http://)?(?:\w+\.)?liveleak\.com/view\?(?:.*?)i=(?P<video_id>[\w_]+)(?:.*)'
     IE_NAME = u'liveleak'
     _TEST = {
         u'url': u'http://www.liveleak.com/view?i=757_1364311680',
diff --git a/youtube_dl/extractor/livestream.py b/youtube_dl/extractor/livestream.py
index 9bc35b1150..1dcd1fb2de 100644
--- a/youtube_dl/extractor/livestream.py
+++ b/youtube_dl/extractor/livestream.py
@@ -11,7 +11,7 @@ from ..utils import (
 
 class LivestreamIE(InfoExtractor):
     IE_NAME = u'livestream'
-    _VALID_URL = r'http://new.livestream.com/.*?/(?P<event_name>.*?)(/videos/(?P<id>\d+))?/?$'
+    _VALID_URL = r'http://new\.livestream\.com/.*?/(?P<event_name>.*?)(/videos/(?P<id>\d+))?/?$'
     _TEST = {
         u'url': u'http://new.livestream.com/CoheedandCambria/WebsterHall/videos/4719370',
         u'file': u'4719370.mp4',
diff --git a/youtube_dl/extractor/muzu.py b/youtube_dl/extractor/muzu.py
index 03e31ea1c9..1772b7f9ae 100644
--- a/youtube_dl/extractor/muzu.py
+++ b/youtube_dl/extractor/muzu.py
@@ -9,7 +9,7 @@ from ..utils import (
 
 
 class MuzuTVIE(InfoExtractor):
-    _VALID_URL = r'https?://www.muzu.tv/(.+?)/(.+?)/(?P<id>\d+)'
+    _VALID_URL = r'https?://www\.muzu\.tv/(.+?)/(.+?)/(?P<id>\d+)'
     IE_NAME = u'muzu.tv'
 
     _TEST = {
diff --git a/youtube_dl/extractor/myspass.py b/youtube_dl/extractor/myspass.py
index 0067bf134f..4becddee60 100644
--- a/youtube_dl/extractor/myspass.py
+++ b/youtube_dl/extractor/myspass.py
@@ -9,7 +9,7 @@ from ..utils import (
 
 
 class MySpassIE(InfoExtractor):
-    _VALID_URL = r'http://www.myspass.de/.*'
+    _VALID_URL = r'http://www\.myspass\.de/.*'
     _TEST = {
         u'url': u'http://www.myspass.de/myspass/shows/tvshows/absolute-mehrheit/Absolute-Mehrheit-vom-17022013-Die-Highlights-Teil-2--/11741/',
         u'file': u'11741.mp4',
diff --git a/youtube_dl/extractor/orf.py b/youtube_dl/extractor/orf.py
index cfca2a0635..b42eae89ac 100644
--- a/youtube_dl/extractor/orf.py
+++ b/youtube_dl/extractor/orf.py
@@ -12,7 +12,7 @@ from ..utils import (
 )
 
 class ORFIE(InfoExtractor):
-    _VALID_URL = r'https?://tvthek.orf.at/(programs/.+?/episodes|topics/.+?)/(?P<id>\d+)'
+    _VALID_URL = r'https?://tvthek\.orf\.at/(programs/.+?/episodes|topics/.+?)/(?P<id>\d+)'
 
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
diff --git a/youtube_dl/extractor/pbs.py b/youtube_dl/extractor/pbs.py
index 65462d8670..25f019231e 100644
--- a/youtube_dl/extractor/pbs.py
+++ b/youtube_dl/extractor/pbs.py
@@ -5,7 +5,7 @@ from .common import InfoExtractor
 
 
 class PBSIE(InfoExtractor):
-    _VALID_URL = r'https?://video.pbs.org/video/(?P<id>\d+)/?'
+    _VALID_URL = r'https?://video\.pbs\.org/video/(?P<id>\d+)/?'
 
     _TEST = {
         u'url': u'http://video.pbs.org/video/2365006249/',
diff --git a/youtube_dl/extractor/rutube.py b/youtube_dl/extractor/rutube.py
index a18034fe26..e3e9bc07ff 100644
--- a/youtube_dl/extractor/rutube.py
+++ b/youtube_dl/extractor/rutube.py
@@ -11,7 +11,7 @@ from ..utils import (
 
 
 class RutubeIE(InfoExtractor):
-    _VALID_URL = r'https?://rutube.ru/video/(?P<long_id>\w+)'
+    _VALID_URL = r'https?://rutube\.ru/video/(?P<long_id>\w+)'
 
     _TEST = {
         u'url': u'http://rutube.ru/video/3eac3b4561676c17df9132a9a1e62e3e/',
diff --git a/youtube_dl/extractor/slashdot.py b/youtube_dl/extractor/slashdot.py
index f5003c7f91..d68646d24b 100644
--- a/youtube_dl/extractor/slashdot.py
+++ b/youtube_dl/extractor/slashdot.py
@@ -4,7 +4,7 @@ from .common import InfoExtractor
 
 
 class SlashdotIE(InfoExtractor):
-    _VALID_URL = r'https?://tv.slashdot.org/video/\?embed=(?P<id>.*?)(&|$)'
+    _VALID_URL = r'https?://tv\.slashdot\.org/video/\?embed=(?P<id>.*?)(&|$)'
 
     _TEST = {
         u'add_ie': ['Ooyala'],
diff --git a/youtube_dl/extractor/soundcloud.py b/youtube_dl/extractor/soundcloud.py
index 3a19ab1722..cb6dedab75 100644
--- a/youtube_dl/extractor/soundcloud.py
+++ b/youtube_dl/extractor/soundcloud.py
@@ -25,7 +25,7 @@ class SoundcloudIE(InfoExtractor):
     _VALID_URL = r'''^(?:https?://)?
                     (?:(?:(?:www\.)?soundcloud\.com/([\w\d-]+)/([\w\d-]+)/?(?:[?].*)?$)
                        |(?:api\.soundcloud\.com/tracks/(?P<track_id>\d+))
-                       |(?P<widget>w.soundcloud.com/player/?.*?url=.*)
+                       |(?P<widget>w\.soundcloud\.com/player/?.*?url=.*)
                     )
                     '''
     IE_NAME = u'soundcloud'
@@ -217,7 +217,7 @@ class SoundcloudSetIE(SoundcloudIE):
 
 
 class SoundcloudUserIE(SoundcloudIE):
-    _VALID_URL = r'https?://(www\.)?soundcloud.com/(?P<user>[^/]+)(/?(tracks/)?)?(\?.*)?$'
+    _VALID_URL = r'https?://(www\.)?soundcloud\.com/(?P<user>[^/]+)(/?(tracks/)?)?(\?.*)?$'
     IE_NAME = u'soundcloud:user'
 
     # it's in tests/test_playlists.py
diff --git a/youtube_dl/extractor/space.py b/youtube_dl/extractor/space.py
index 0d32a06889..11455e0fa2 100644
--- a/youtube_dl/extractor/space.py
+++ b/youtube_dl/extractor/space.py
@@ -6,7 +6,7 @@ from ..utils import RegexNotFoundError, ExtractorError
 
 
 class SpaceIE(InfoExtractor):
-    _VALID_URL = r'https?://www\.space\.com/\d+-(?P<title>[^/\.\?]*?)-video.html'
+    _VALID_URL = r'https?://www\.space\.com/\d+-(?P<title>[^/\.\?]*?)-video\.html'
     _TEST = {
         u'add_ie': ['Brightcove'],
         u'url': u'http://www.space.com/23373-huge-martian-landforms-detail-revealed-by-european-probe-video.html',
diff --git a/youtube_dl/extractor/stanfordoc.py b/youtube_dl/extractor/stanfordoc.py
index b27838bf9d..d54e01a129 100644
--- a/youtube_dl/extractor/stanfordoc.py
+++ b/youtube_dl/extractor/stanfordoc.py
@@ -18,7 +18,7 @@ from ..utils import (
 class StanfordOpenClassroomIE(InfoExtractor):
     IE_NAME = u'stanfordoc'
     IE_DESC = u'Stanford Open ClassRoom'
-    _VALID_URL = r'^(?:https?://)?openclassroom.stanford.edu(?P<path>/?|(/MainFolder/(?:HomePage|CoursePage|VideoPage)\.php([?]course=(?P<course>[^&]+)(&video=(?P<video>[^&]+))?(&.*)?)?))$'
+    _VALID_URL = r'^(?:https?://)?openclassroom\.stanford\.edu(?P<path>/?|(/MainFolder/(?:HomePage|CoursePage|VideoPage)\.php([?]course=(?P<course>[^&]+)(&video=(?P<video>[^&]+))?(&.*)?)?))$'
     _TEST = {
         u'url': u'http://openclassroom.stanford.edu/MainFolder/VideoPage.php?course=PracticalUnix&video=intro-environment&speed=100',
         u'file': u'PracticalUnix_intro-environment.mp4',
diff --git a/youtube_dl/extractor/tf1.py b/youtube_dl/extractor/tf1.py
index 772134a128..2c5c88be8e 100644
--- a/youtube_dl/extractor/tf1.py
+++ b/youtube_dl/extractor/tf1.py
@@ -7,7 +7,7 @@ from .common import InfoExtractor
 
 class TF1IE(InfoExtractor):
     """TF1 uses the wat.tv player."""
-    _VALID_URL = r'http://videos.tf1.fr/.*-(.*?).html'
+    _VALID_URL = r'http://videos\.tf1\.fr/.*-(.*?)\.html'
     _TEST = {
         u'url': u'http://videos.tf1.fr/auto-moto/citroen-grand-c4-picasso-2013-presentation-officielle-8062060.html',
         u'file': u'10635995.mp4',
diff --git a/youtube_dl/extractor/unistra.py b/youtube_dl/extractor/unistra.py
index 516e18914e..474610eec7 100644
--- a/youtube_dl/extractor/unistra.py
+++ b/youtube_dl/extractor/unistra.py
@@ -3,7 +3,7 @@ import re
 from .common import InfoExtractor
 
 class UnistraIE(InfoExtractor):
-    _VALID_URL = r'http://utv.unistra.fr/(?:index|video).php\?id_video\=(\d+)'
+    _VALID_URL = r'http://utv\.unistra\.fr/(?:index|video)\.php\?id_video\=(\d+)'
 
     _TEST = {
         u'url': u'http://utv.unistra.fr/video.php?id_video=154',
diff --git a/youtube_dl/extractor/veehd.py b/youtube_dl/extractor/veehd.py
index 3a99a29c65..3cf8c853d2 100644
--- a/youtube_dl/extractor/veehd.py
+++ b/youtube_dl/extractor/veehd.py
@@ -9,7 +9,7 @@ from ..utils import (
 )
 
 class VeeHDIE(InfoExtractor):
-    _VALID_URL = r'https?://veehd.com/video/(?P<id>\d+)'
+    _VALID_URL = r'https?://veehd\.com/video/(?P<id>\d+)'
 
     _TEST = {
         u'url': u'http://veehd.com/video/4686958',
diff --git a/youtube_dl/extractor/vevo.py b/youtube_dl/extractor/vevo.py
index 4378b17800..d8bfcd1553 100644
--- a/youtube_dl/extractor/vevo.py
+++ b/youtube_dl/extractor/vevo.py
@@ -15,7 +15,7 @@ class VevoIE(InfoExtractor):
     Accepts urls from vevo.com or in the format 'vevo:{id}'
     (currently used by MTVIE)
     """
-    _VALID_URL = r'((http://www.vevo.com/watch/.*?/.*?/)|(vevo:))(?P<id>.*?)(\?|$)'
+    _VALID_URL = r'((http://www\.vevo\.com/watch/.*?/.*?/)|(vevo:))(?P<id>.*?)(\?|$)'
     _TESTS = [{
         u'url': u'http://www.vevo.com/watch/hurts/somebody-to-die-for/GB1101300280',
         u'file': u'GB1101300280.mp4',
diff --git a/youtube_dl/extractor/vice.py b/youtube_dl/extractor/vice.py
index 6b93afa50f..87812d6afa 100644
--- a/youtube_dl/extractor/vice.py
+++ b/youtube_dl/extractor/vice.py
@@ -6,7 +6,7 @@ from ..utils import ExtractorError
 
 
 class ViceIE(InfoExtractor):
-    _VALID_URL = r'http://www.vice.com/.*?/(?P<name>.+)'
+    _VALID_URL = r'http://www\.vice\.com/.*?/(?P<name>.+)'
 
     _TEST = {
         u'url': u'http://www.vice.com/Fringes/cowboy-capitalists-part-1',
diff --git a/youtube_dl/extractor/viddler.py b/youtube_dl/extractor/viddler.py
index 75335dfb87..138a35b2a0 100644
--- a/youtube_dl/extractor/viddler.py
+++ b/youtube_dl/extractor/viddler.py
@@ -8,7 +8,7 @@ from ..utils import (
 
 
 class ViddlerIE(InfoExtractor):
-    _VALID_URL = r'(?P<domain>https?://(?:www\.)?viddler.com)/(?:v|embed|player)/(?P<id>[a-z0-9]+)'
+    _VALID_URL = r'(?P<domain>https?://(?:www\.)?viddler\.com)/(?:v|embed|player)/(?P<id>[a-z0-9]+)'
     _TEST = {
         u"url": u"http://www.viddler.com/v/43903784",
         u'file': u'43903784.mp4',
diff --git a/youtube_dl/extractor/videofyme.py b/youtube_dl/extractor/videofyme.py
index 912802d9aa..f75169041b 100644
--- a/youtube_dl/extractor/videofyme.py
+++ b/youtube_dl/extractor/videofyme.py
@@ -7,7 +7,7 @@ from ..utils import (
 )
 
 class VideofyMeIE(InfoExtractor):
-    _VALID_URL = r'https?://(www.videofy.me/.+?|p.videofy.me/v)/(?P<id>\d+)(&|#|$)'
+    _VALID_URL = r'https?://(www\.videofy\.me/.+?|p\.videofy\.me/v)/(?P<id>\d+)(&|#|$)'
     IE_NAME = u'videofy.me'
 
     _TEST = {
diff --git a/youtube_dl/extractor/wat.py b/youtube_dl/extractor/wat.py
index 29c25f0e30..4fab6c6e85 100644
--- a/youtube_dl/extractor/wat.py
+++ b/youtube_dl/extractor/wat.py
@@ -11,7 +11,7 @@ from ..utils import (
 
 
 class WatIE(InfoExtractor):
-    _VALID_URL=r'http://www.wat.tv/.*-(?P<shortID>.*?)_.*?.html'
+    _VALID_URL=r'http://www\.wat\.tv/.*-(?P<shortID>.*?)_.*?\.html'
     IE_NAME = 'wat.tv'
     _TEST = {
         u'url': u'http://www.wat.tv/video/world-war-philadelphia-vost-6bv55_2fjr7_.html',
diff --git a/youtube_dl/extractor/youjizz.py b/youtube_dl/extractor/youjizz.py
index 1fcc518acd..e971b5b4b3 100644
--- a/youtube_dl/extractor/youjizz.py
+++ b/youtube_dl/extractor/youjizz.py
@@ -7,7 +7,7 @@ from ..utils import (
 
 
 class YouJizzIE(InfoExtractor):
-    _VALID_URL = r'^(?:https?://)?(?:\w+\.)?youjizz\.com/videos/(?P<videoid>[^.]+).html$'
+    _VALID_URL = r'^(?:https?://)?(?:\w+\.)?youjizz\.com/videos/(?P<videoid>[^.]+)\.html$'
     _TEST = {
         u'url': u'http://www.youjizz.com/videos/zeichentrick-1-2189178.html',
         u'file': u'2189178.flv',