diff --git a/youtube_dl/extractor/streamsb.py b/youtube_dl/extractor/streamsb.py
index fd2826e3e..bffcb3de1 100644
--- a/youtube_dl/extractor/streamsb.py
+++ b/youtube_dl/extractor/streamsb.py
@@ -1,10 +1,13 @@
 # coding: utf-8
 from __future__ import unicode_literals
 
+import binascii
 import random
+import re
 import string
 
 from .common import InfoExtractor
+from ..utils import urljoin, url_basename
 
 
 def to_ascii_hex(str1):
@@ -17,7 +20,7 @@ def generate_random_string(length):
 
 class StreamsbIE(InfoExtractor):
     _DOMAINS = ('viewsb.com', )
-    _VALID_URL = r'https://' + domain + '/(?P<id>.+)'
+    _VALID_URL = r'https://(?P<domain>%s)/(?P<id>.+)' % '|'.join(_DOMAINS)
     _TEST = {
         'url': 'https://viewsb.com/dxfvlu4qanjx',
         'md5': '488d111a63415369bf90ea83adc8a325',
@@ -29,21 +32,20 @@ class StreamsbIE(InfoExtractor):
     }
 
     def _real_extract(self, url):
-        video_id = self._match_id(url)
+        domain, video_id = re.match(self._VALID_URL, url).group('domain', 'id')
         webpage = self._download_webpage(url, video_id)
 
         iframe_rel_url = self._search_regex(r'''(?i)<iframe\b[^>]+\bsrc\s*=\s*('|")(?P<path>/.*\.html)\1''', webpage, 'iframe', group='path')
-        iframe_url = urljoin('https://' + self.domain, iframe_rel_url)
+        iframe_url = urljoin('https://' + domain, iframe_rel_url)
 
         iframe_data = self._download_webpage(iframe_url, video_id)
-        app_version = self._search_regex(r'''<script\b[^>]+\bsrc\s*=\s*("|')(?:(?!\1).)*/app\.min\.(\d+)\.js''', iframe_data, 'app version', fatal=False) or '50'
+        app_version = self._search_regex(r'''<script\b[^>]+\bsrc\s*=\s*["|'].*/app\.min\.(\d+)\.js''', iframe_data, 'app version', fatal=False) or '50'
 
         video_code = url_basename(iframe_url).rsplit('.')[0]
 
         length = 12
         req = '||'.join((generate_random_string(length), video_code, generate_random_string(length), 'streamsb'))
-        ereq = 'https://{0}/sources{1}/{2}'.format(
-            self.domain, app_version, to_ascii_hex(req))
+        ereq = 'https://{0}/sources{1}/{2}'.format(domain, app_version, to_ascii_hex(req))
 
         video_data = self._download_webpage(ereq, video_id, headers={
             'Referer': iframe_url,