diff --git a/src/you_get/common.py b/src/you_get/common.py
index f6956fadc7..0b307ddee8 100755
--- a/src/you_get/common.py
+++ b/src/you_get/common.py
@@ -715,7 +715,7 @@ def url_save(
                         bar.done()
                     if not force and auto_rename:
                         path, ext = os.path.basename(filepath).rsplit('.', 1)
-                        finder = re.compile(' \([1-9]\d*?\)$')
+                        finder = re.compile(r' \([1-9]\d*?\)$')
                         if (finder.search(path) is None):
                             thisfile = path + ' (1).' + ext
                         else:
diff --git a/src/you_get/extractors/acfun.py b/src/you_get/extractors/acfun.py
index cd27592789..5775eb5e74 100644
--- a/src/you_get/extractors/acfun.py
+++ b/src/you_get/extractors/acfun.py
@@ -32,7 +32,7 @@ def prepare(self, **kwargs):
                 self.title += " - " + [p.get('title') for p in video_list if p.get('id') == vid][0]
             currentVideoInfo = json_data.get('currentVideoInfo')
 
-        elif re.match("https?://[^\.]*\.*acfun\.[^\.]+/bangumi/aa(\d+)", self.url):
+        elif re.match(r"https?://[^\.]*\.*acfun\.[^\.]+/bangumi/aa(\d+)", self.url):
             html = get_content(self.url, headers=fake_headers)
             tag_script = match1(html, r'<script>\s*window\.pageInfo([^<]+)</script>')
             json_text = tag_script[tag_script.find('{') : tag_script.find('};') + 1]
@@ -180,7 +180,7 @@ def getM3u8UrlFromCurrentVideoInfo(currentVideoInfo):
                 title += " - " + [p.get('title') for p in video_list if p.get('id') == vid][0]
             currentVideoInfo = json_data.get('currentVideoInfo')
             m3u8_url = getM3u8UrlFromCurrentVideoInfo(currentVideoInfo)
-        elif re.match("https?://[^\.]*\.*acfun\.[^\.]+/bangumi/aa(\d+)", url):
+        elif re.match(r'https?://[^\.]*\.*acfun\.[^\.]+/bangumi/aa(\d+)', url):
             html = get_content(url, headers=fake_headers)
             tag_script = match1(html, r'<script>\s*window\.pageInfo([^<]+)</script>')
             json_text = tag_script[tag_script.find('{') : tag_script.find('};') + 1]
diff --git a/src/you_get/extractors/baidu.py b/src/you_get/extractors/baidu.py
index 521d5e996f..61b0ad246f 100644
--- a/src/you_get/extractors/baidu.py
+++ b/src/you_get/extractors/baidu.py
@@ -116,7 +116,7 @@ def baidu_download(url, output_dir='.', stream_type=None, merge=True, info_only=
         id = r1(r'https?://music.baidu.com/album/(\d+)', url)
         baidu_download_album(id, output_dir, merge, info_only)
 
-    elif re.match('https?://music.baidu.com/song/\d+', url):
+    elif re.match(r'https?://music.baidu.com/song/\d+', url):
         id = r1(r'https?://music.baidu.com/song/(\d+)', url)
         baidu_download_song(id, output_dir, merge, info_only)
 
diff --git a/src/you_get/extractors/coub.py b/src/you_get/extractors/coub.py
index a71cbc18e5..b7becb4577 100644
--- a/src/you_get/extractors/coub.py
+++ b/src/you_get/extractors/coub.py
@@ -58,7 +58,7 @@ def fix_coub_video_file(file_path):
 
 
 def get_title_and_urls(json_data):
-    title = legitimize(re.sub('[\s*]', "_", json_data['title']))
+    title = legitimize(re.sub(r'[\s*]', "_", json_data['title']))
     video_info = json_data['file_versions']['html5']['video']
     if 'high' not in video_info:
         if 'med' not in video_info:
diff --git a/src/you_get/extractors/douban.py b/src/you_get/extractors/douban.py
index 1a4a67d179..17b7a8c591 100644
--- a/src/you_get/extractors/douban.py
+++ b/src/you_get/extractors/douban.py
@@ -10,7 +10,7 @@ def douban_download(url, output_dir = '.', merge = True, info_only = False, **kw
 
     if re.match(r'https?://movie', url):
         title = match1(html, 'name="description" content="([^"]+)')
-        tid = match1(url, 'trailer/(\d+)')
+        tid = match1(url, r'trailer/(\d+)')
         real_url = 'https://movie.douban.com/trailer/video_url?tid=%s' % tid
         type, ext, size = url_info(real_url)
 
diff --git a/src/you_get/extractors/embed.py b/src/you_get/extractors/embed.py
index aedf5137a2..48092df182 100644
--- a/src/you_get/extractors/embed.py
+++ b/src/you_get/extractors/embed.py
@@ -20,18 +20,18 @@
 """
 refer to http://open.youku.com/tools
 """
-youku_embed_patterns = [ 'youku\.com/v_show/id_([a-zA-Z0-9=]+)',
-                         'player\.youku\.com/player\.php/sid/([a-zA-Z0-9=]+)/v\.swf',
-                         'loader\.swf\?VideoIDS=([a-zA-Z0-9=]+)',
-                         'player\.youku\.com/embed/([a-zA-Z0-9=]+)',
-                         'YKU.Player\(\'[a-zA-Z0-9]+\',{ client_id: \'[a-zA-Z0-9]+\', vid: \'([a-zA-Z0-9]+)\''
+youku_embed_patterns = [ r'youku\.com/v_show/id_([a-zA-Z0-9=]+)',
+                         r'player\.youku\.com/player\.php/sid/([a-zA-Z0-9=]+)/v\.swf',
+                         r'loader\.swf\?VideoIDS=([a-zA-Z0-9=]+)',
+                         r'player\.youku\.com/embed/([a-zA-Z0-9=]+)',
+                         r'YKU.Player\(\'[a-zA-Z0-9]+\',{ client_id: \'[a-zA-Z0-9]+\', vid: \'([a-zA-Z0-9]+)\''
                        ]
 
 """
 http://www.tudou.com/programs/view/html5embed.action?type=0&amp;code=3LS_URGvl54&amp;lcode=&amp;resourceId=0_06_05_99
 """
-tudou_embed_patterns = [ 'tudou\.com[a-zA-Z0-9\/\?=\&\.\;]+code=([a-zA-Z0-9_-]+)\&',
-                         'www\.tudou\.com/v/([a-zA-Z0-9_-]+)/[^"]*v\.swf'
+tudou_embed_patterns = [ r'tudou\.com[a-zA-Z0-9\/\?=\&\.\;]+code=([a-zA-Z0-9_-]+)\&',
+                         r'www\.tudou\.com/v/([a-zA-Z0-9_-]+)/[^"]*v\.swf'
                        ]
 
 """
@@ -39,18 +39,18 @@
 """
 tudou_api_patterns = [ ]
 
-iqiyi_embed_patterns = [ 'player\.video\.qiyi\.com/([^/]+)/[^/]+/[^/]+/[^/]+\.swf[^"]+tvId=(\d+)' ]
+iqiyi_embed_patterns = [ r'player\.video\.qiyi\.com/([^/]+)/[^/]+/[^/]+/[^/]+\.swf[^"]+tvId=(\d+)' ]
 
-netease_embed_patterns = [ '(http://\w+\.163\.com/movie/[^\'"]+)' ]
+netease_embed_patterns = [ r'(http://\w+\.163\.com/movie/[^\'"]+)' ]
 
-vimeo_embed_patters = [ 'player\.vimeo\.com/video/(\d+)' ]
+vimeo_embed_patters = [ r'player\.vimeo\.com/video/(\d+)' ]
 
-dailymotion_embed_patterns = [ 'www\.dailymotion\.com/embed/video/(\w+)' ]
+dailymotion_embed_patterns = [ r'www\.dailymotion\.com/embed/video/(\w+)' ]
 
 """
 check the share button on http://www.bilibili.com/video/av5079467/
 """
-bilibili_embed_patterns = [ 'static\.hdslb\.com/miniloader\.swf.*aid=(\d+)' ]
+bilibili_embed_patterns = [ r'static\.hdslb\.com/miniloader\.swf.*aid=(\d+)' ]
 
 
 '''
diff --git a/src/you_get/extractors/funshion.py b/src/you_get/extractors/funshion.py
index 1f7156b5e3..2bb1aba027 100644
--- a/src/you_get/extractors/funshion.py
+++ b/src/you_get/extractors/funshion.py
@@ -84,7 +84,7 @@ def search_dict(a_dict, target):
 
                 moz_ec_name = search_dict(sym_to_name, 'mozEcName')
                 push = search_dict(sym_to_name, 'push')
-                patt = '{}\.{}\("(.+?)"\)'.format(moz_ec_name, push)
+                patt = r'{}\.{}\("(.+?)"\)'.format(moz_ec_name, push)
                 ec_list = re.findall(patt, code)
                 [magic_list.append(sym_to_name[ec]) for ec in ec_list]
         return magic_list
diff --git a/src/you_get/extractors/ku6.py b/src/you_get/extractors/ku6.py
index c827eafd81..d37d894725 100644
--- a/src/you_get/extractors/ku6.py
+++ b/src/you_get/extractors/ku6.py
@@ -50,7 +50,7 @@ def ku6_download(url, output_dir = '.', merge = True, info_only = False, **kwarg
             vid = vid.group(1)
         else:
             raise Exception('Unsupported url')
-        this_meta = re.search('"?'+vid+'"?:\{(.+?)\}', meta)
+        this_meta = re.search('"?'+vid+r'"?:\{(.+?)\}', meta)
         if this_meta is not None:
             this_meta = this_meta.group(1)
             title = re.search('title:"(.+?)"', this_meta).group(1)
diff --git a/src/you_get/extractors/kugou.py b/src/you_get/extractors/kugou.py
index 192bd809d7..18b342bf7e 100644
--- a/src/you_get/extractors/kugou.py
+++ b/src/you_get/extractors/kugou.py
@@ -32,8 +32,8 @@ def kugou_download(url, output_dir=".", merge=True, info_only=False, **kwargs):
 def kugou_download_by_hash(url, output_dir='.', merge=True, info_only=False):
     # sample
     # url_sample:http://www.kugou.com/song/#hash=93F7D2FC6E95424739448218B591AEAF&album_id=9019462
-    hash_val = match1(url, 'hash=(\w+)')
-    album_id = match1(url, 'album_id=(\d+)')
+    hash_val = match1(url, r'hash=(\w+)')
+    album_id = match1(url, r'album_id=(\d+)')
     if not album_id:
         album_id = 123
     html = get_html("http://www.kugou.com/yy/index.php?r=play/getdata&hash={}&album_id={}&mid=123".format(hash_val, album_id))
@@ -60,7 +60,7 @@ def kugou_download_playlist(url, output_dir='.', merge=True, info_only=False, **
         res = pattern.findall(html)
         for song in res:
             res = get_html(song)
-            pattern_url = re.compile('"hash":"(\w+)".*"album_id":(\d)+')
+            pattern_url = re.compile(r'"hash":"(\w+)".*"album_id":(\d)+')
             hash_val, album_id = res = pattern_url.findall(res)[0]
             if not album_id:
                 album_id = 123
@@ -70,7 +70,7 @@ def kugou_download_playlist(url, output_dir='.', merge=True, info_only=False, **
     # album sample:   http://www.kugou.com/yy/album/single/1645030.html
     elif url.lower().find('album') != -1:
         html = get_html(url)
-        pattern = re.compile('var data=(\[.*?\]);')
+        pattern = re.compile(r'var data=(\[.*?\]);')
         res = pattern.findall(html)[0]
         for v in json.loads(res):
             urls.append('http://www.kugou.com/song/#hash=%s&album_id=%s' % (v['hash'], v['album_id']))
@@ -79,7 +79,7 @@ def kugou_download_playlist(url, output_dir='.', merge=True, info_only=False, **
     # playlist sample:http://www.kugou.com/yy/special/single/487279.html
     else:
         html = get_html(url)
-        pattern = re.compile('data="(\w+)\|(\d+)"')
+        pattern = re.compile(r'data="(\w+)\|(\d+)"')
         for v in pattern.findall(html):
             urls.append('http://www.kugou.com/song/#hash=%s&album_id=%s' % (v[0], v[1]))
             print('http://www.kugou.com/song/#hash=%s&album_id=%s' % (v[0], v[1]))
diff --git a/src/you_get/extractors/kuwo.py b/src/you_get/extractors/kuwo.py
index 54c09235e9..dceab68fd5 100644
--- a/src/you_get/extractors/kuwo.py
+++ b/src/you_get/extractors/kuwo.py
@@ -18,7 +18,7 @@ def kuwo_download_by_rid(rid, output_dir = '.', merge = True, info_only = False)
 
 def kuwo_playlist_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     html=get_content(url)
-    matched=set(re.compile("yinyue/(\d+)").findall(html))#reduce duplicated
+    matched=set(re.compile(r"yinyue/(\d+)").findall(html))#reduce duplicated
     for rid in matched:
         kuwo_download_by_rid(rid,output_dir,merge,info_only)
 
@@ -26,7 +26,7 @@ def kuwo_playlist_download(url, output_dir = '.', merge = True, info_only = Fals
 
 def kuwo_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
     if "www.kuwo.cn/yinyue" in url:
-        rid=match1(url,'yinyue/(\d+)')
+        rid=match1(url, r'yinyue/(\d+)')
         kuwo_download_by_rid(rid,output_dir, merge, info_only)
     else:
         kuwo_playlist_download(url,output_dir,merge,info_only)
diff --git a/src/you_get/extractors/mgtv.py b/src/you_get/extractors/mgtv.py
index 053212efa0..f241ba6f1a 100644
--- a/src/you_get/extractors/mgtv.py
+++ b/src/you_get/extractors/mgtv.py
@@ -44,11 +44,11 @@ def tk2(self):
     def get_vid_from_url(url):
         """Extracts video ID from URL.
         """
-        vid = match1(url, 'https?://www.mgtv.com/(?:b|l)/\d+/(\d+).html')
+        vid = match1(url, r'https?://www.mgtv.com/(?:b|l)/\d+/(\d+).html')
         if not vid:
-            vid = match1(url, 'https?://www.mgtv.com/hz/bdpz/\d+/(\d+).html')
+            vid = match1(url, r'https?://www.mgtv.com/hz/bdpz/\d+/(\d+).html')
         if not vid:
-            vid = match1(url, 'https?://www.mgtv.com/s/(\d+).html')
+            vid = match1(url, r'https?://www.mgtv.com/s/(\d+).html')
         return vid
 
     # ----------------------------------------------------------------------
diff --git a/src/you_get/extractors/qq.py b/src/you_get/extractors/qq.py
index e38770e9c0..6cb76e1d9c 100644
--- a/src/you_get/extractors/qq.py
+++ b/src/you_get/extractors/qq.py
@@ -83,7 +83,7 @@ def kg_qq_download_by_shareid(shareid, output_dir='.', info_only=False, caption=
     playurl = json_data['data']['playurl']
     videourl = json_data['data']['playurl_video']
     real_url = playurl if playurl else videourl
-    real_url = real_url.replace('\/', '/')
+    real_url = real_url.replace(r'\/', '/')
 
     ksong_mid = json_data['data']['ksong_mid']
     lyric_url = 'http://cgi.kg.qq.com/fcgi-bin/fcg_lyric?jsonpCallback=jsopgetlrcdata&outCharset=utf-8&ksongmid=' + ksong_mid
diff --git a/src/you_get/extractors/sohu.py b/src/you_get/extractors/sohu.py
index 74374202e2..e0e4eeb97e 100644
--- a/src/you_get/extractors/sohu.py
+++ b/src/you_get/extractors/sohu.py
@@ -23,7 +23,7 @@ def real_url(fileName, key, ch):
 
 def sohu_download(url, output_dir='.', merge=True, info_only=False, extractor_proxy=None, **kwargs):
     if re.match(r'http://share.vrs.sohu.com', url):
-        vid = r1('id=(\d+)', url)
+        vid = r1(r'id=(\d+)', url)
     else:
         html = get_html(url)
         vid = r1(r'\Wvid\s*[\:=]\s*[\'"]?(\d+)[\'"]?', html) or r1(r'bid:\'(\d+)\',', html) or r1(r'bid=(\d+)', html)
diff --git a/src/you_get/extractors/tudou.py b/src/you_get/extractors/tudou.py
index b1568dfd13..92b8393ce6 100644
--- a/src/you_get/extractors/tudou.py
+++ b/src/you_get/extractors/tudou.py
@@ -71,7 +71,7 @@ def tudou_download(url, output_dir = '.', merge = True, info_only = False, **kwa
 
 # obsolete?
 def parse_playlist(url):
-    aid = r1('http://www.tudou.com/playlist/p/a(\d+)(?:i\d+)?\.html', url)
+    aid = r1(r'http://www.tudou.com/playlist/p/a(\d+)(?:i\d+)?\.html', url)
     html = get_decoded_html(url)
     if not aid:
         aid = r1(r"aid\s*[:=]\s*'(\d+)'", html)
diff --git a/src/you_get/extractors/tumblr.py b/src/you_get/extractors/tumblr.py
index 08e605e82c..236ba18274 100644
--- a/src/you_get/extractors/tumblr.py
+++ b/src/you_get/extractors/tumblr.py
@@ -34,7 +34,7 @@ def tumblr_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
                      post_data_raw='{"eu_resident":true,"gdpr_is_acceptable_age":true,"gdpr_consent_core":true,"gdpr_consent_first_party_ads":true,"gdpr_consent_third_party_ads":true,"gdpr_consent_search_history":true,"redirect_to":"%s","gdpr_reconsent":false}' % url)
         page = get_html(url, faker=True)
 
-    html = parse.unquote(page).replace('\/', '/')
+    html = parse.unquote(page).replace(r'\/', '/')
     feed = r1(r'<meta property="og:type" content="tumblr-feed:(\w+)" />', html)
 
     if feed in ['photo', 'photoset', 'entry'] or feed is None:
diff --git a/src/you_get/extractors/twitter.py b/src/you_get/extractors/twitter.py
index b2c5878a9d..299dc05240 100644
--- a/src/you_get/extractors/twitter.py
+++ b/src/you_get/extractors/twitter.py
@@ -33,7 +33,7 @@ def twitter_download(url, output_dir='.', merge=True, info_only=False, **kwargs)
                              **kwargs)
         return
 
-    m = re.match('^https?://(mobile\.)?(x|twitter)\.com/([^/]+)/status/(\d+)', url)
+    m = re.match(r'^https?://(mobile\.)?(x|twitter)\.com/([^/]+)/status/(\d+)', url)
     assert m
     screen_name, item_id = m.group(3), m.group(4)
     page_title = "{} [{}]".format(screen_name, item_id)
diff --git a/src/you_get/extractors/universal.py b/src/you_get/extractors/universal.py
index 4a3268ab89..03bba35af6 100644
--- a/src/you_get/extractors/universal.py
+++ b/src/you_get/extractors/universal.py
@@ -48,7 +48,7 @@ def universal_download(url, output_dir='.', merge=True, info_only=False, **kwarg
             else:
                 return
 
-        hls_urls = re.findall(r'(https?://[^;"\'\\]+' + '\.m3u8?' +
+        hls_urls = re.findall(r'(https?://[^;"\'\\]+' + r'\.m3u8?' +
                               r'[^;"\'\\]*)', page)
         if hls_urls:
             try:
@@ -64,14 +64,14 @@ def universal_download(url, output_dir='.', merge=True, info_only=False, **kwarg
                 return
 
         # most common media file extensions on the Internet
-        media_exts = ['\.flv', '\.mp3', '\.mp4', '\.webm',
-                      '[-_]1\d\d\d\.jpe?g', '[-_][6-9]\d\d\.jpe?g', # tumblr
-                      '[-_]1\d\d\dx[6-9]\d\d\.jpe?g',
-                      '[-_][6-9]\d\dx1\d\d\d\.jpe?g',
-                      '[-_][6-9]\d\dx[6-9]\d\d\.jpe?g',
-                      's1600/[\w%]+\.jpe?g', # blogger
-                      'blogger\.googleusercontent\.com/img/a/\w*', # blogger
-                      'img[6-9]\d\d/[\w%]+\.jpe?g' # oricon?
+        media_exts = [r'\.flv', r'\.mp3', r'\.mp4', r'\.webm',
+                      r'[-_]1\d\d\d\.jpe?g', r'[-_][6-9]\d\d\.jpe?g', # tumblr
+                      r'[-_]1\d\d\dx[6-9]\d\d\.jpe?g',
+                      r'[-_][6-9]\d\dx1\d\d\d\.jpe?g',
+                      r'[-_][6-9]\d\dx[6-9]\d\d\.jpe?g',
+                      r's1600/[\w%]+\.jpe?g', # blogger
+                      r'blogger\.googleusercontent\.com/img/a/\w*', # blogger
+                      r'img[6-9]\d\d/[\w%]+\.jpe?g' # oricon?
         ]
 
         urls = []
diff --git a/src/you_get/extractors/vimeo.py b/src/you_get/extractors/vimeo.py
index c7d7b05754..8c9f8ebc9e 100644
--- a/src/you_get/extractors/vimeo.py
+++ b/src/you_get/extractors/vimeo.py
@@ -102,7 +102,7 @@ def extract(self, **kwargs):
         pos = 0
         while pos < len(lines):
             if lines[pos].startswith('#EXT-X-STREAM-INF'):
-                patt = 'RESOLUTION=(\d+)x(\d+)'
+                patt = r'RESOLUTION=(\d+)x(\d+)'
                 hit = re.search(patt, lines[pos])
                 if hit is None:
                     continue
diff --git a/src/you_get/extractors/youku.py b/src/you_get/extractors/youku.py
index ed0743bbc0..7a6fb2fc99 100644
--- a/src/you_get/extractors/youku.py
+++ b/src/you_get/extractors/youku.py
@@ -242,7 +242,7 @@ def prepare(self, **kwargs):
 
 def youku_download_playlist_by_url(url, **kwargs):
     video_page_pt = 'https?://v.youku.com/v_show/id_([A-Za-z0-9=]+)'
-    js_cb_pt = '\(({.+})\)'
+    js_cb_pt = r'\(({.+})\)'
     if re.match(video_page_pt, url):
         youku_obj = Youku()
         youku_obj.url = url
@@ -272,14 +272,14 @@ def youku_download_playlist_by_url(url, **kwargs):
         page = get_content(url)
         show_id = re.search(r'showid:"(\d+)"', page).group(1)
         ep = 'http://list.youku.com/show/module?id={}&tab=showInfo&callback=jQuery'.format(show_id)
-        xhr_page = get_content(ep).replace('\/', '/').replace('\"', '"')
+        xhr_page = get_content(ep).replace(r'\/', '/').replace(r'\"', '"')
         video_url = re.search(r'(v.youku.com/v_show/id_(?:[A-Za-z0-9=]+)\.html)', xhr_page).group(1)
         youku_download_playlist_by_url('http://'+video_url, **kwargs)
         return
-    elif re.match('https?://list.youku.com/albumlist/show/id_(\d+)\.html', url):
+    elif re.match(r'https?://list.youku.com/albumlist/show/id_(\d+)\.html', url):
         # http://list.youku.com/albumlist/show/id_2336634.html
         # UGC playlist
-        list_id = re.search('https?://list.youku.com/albumlist/show/id_(\d+)\.html', url).group(1)
+        list_id = re.search(r'https?://list.youku.com/albumlist/show/id_(\d+)\.html', url).group(1)
         ep = 'http://list.youku.com/albumlist/items?id={}&page={}&size=20&ascending=1&callback=tuijsonp6'
 
         first_u = ep.format(list_id, 1)
@@ -294,7 +294,7 @@ def youku_download_playlist_by_url(url, **kwargs):
             for i in range(2, req_cnt+2):
                 req_u = ep.format(list_id, i)
                 xhr_page = get_content(req_u)
-                json_data = json.loads(re.search(js_cb_pt, xhr_page).group(1).replace('\/', '/'))
+                json_data = json.loads(re.search(js_cb_pt, xhr_page).group(1).replace(r'\/', '/'))
                 xhr_html = json_data['html']
                 page_videos = re.findall(r'(v.youku.com/v_show/id_(?:[A-Za-z0-9=]+)\.html)', xhr_html)
                 v_urls.extend(page_videos)
diff --git a/src/you_get/extractors/youtube.py b/src/you_get/extractors/youtube.py
index 0a93d396b8..fe06419940 100644
--- a/src/you_get/extractors/youtube.py
+++ b/src/you_get/extractors/youtube.py
@@ -197,7 +197,7 @@ def prepare(self, **kwargs):
                 self.download_playlist_by_url(self.url, **kwargs)
                 exit(0)
 
-        if re.search('\Wlist=', self.url) and not kwargs.get('playlist'):
+        if re.search(r'\Wlist=', self.url) and not kwargs.get('playlist'):
             log.w('This video is from a playlist. (use --playlist to download all videos in the playlist.)')
 
         # Extract from video page
@@ -205,7 +205,7 @@ def prepare(self, **kwargs):
         video_page = get_content('https://www.youtube.com/watch?v=%s' % self.vid, headers={'User-Agent': self.ua})
 
         try:
-            jsUrl = re.search('([^"]*/base\.js)"', video_page).group(1)
+            jsUrl = re.search(r'([^"]*/base\.js)"', video_page).group(1)
         except:
             log.wtf('[Failed] Unable to find base.js on the video page')
         self.html5player = 'https://www.youtube.com' + jsUrl
@@ -213,7 +213,7 @@ def prepare(self, **kwargs):
         self.js = get_content(self.html5player).replace('\n', ' ')
 
         logging.debug('Loading ytInitialPlayerResponse...')
-        ytInitialPlayerResponse = json.loads(re.search('ytInitialPlayerResponse\s*=\s*([^\n]+?});(\n|</script>|var )', video_page).group(1))
+        ytInitialPlayerResponse = json.loads(re.search(r'ytInitialPlayerResponse\s*=\s*([^\n]+?});(\n|</script>|var )', video_page).group(1))
         self.check_playability_response(ytInitialPlayerResponse)
 
         # Get the video title