Issue 5844 - Remove redundant parentheses in cms

cms/converters.py

 # This file is part of the Adblock Plus web scripts,
 # Copyright (C) 2006-present eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
@@ skipping 170 matching lines @@
         # Insert attributes
         result = escape(result)
 
         def stringify_attribute((name, value)):
             return '{}="{}"'.format(
                 escape(name),
                 escape(self.insert_localized_strings(value, {}))
             )
 
         for tag in self.whitelist:
-            allowed_contents = '(?:[^<>]|{})'.format('|'.join((
+            allowed_contents = '(?:[^<>]|{})'.format('|'.join(
                 '<(?:{}[^<>]*?|/{})>'.format(t, t)
                 for t in map(re.escape, self.whitelist - {tag})
-            )))
+            ))
             saved = saved_attributes.get(tag, [])
             for attrs in saved:
                 attrs = map(stringify_attribute, attrs)
                 result = re.sub(
                     r'{}({}*?){}'.format(re_escape('<{}>'.format(tag)),
                                          allowed_contents,
                                          re_escape('</{}>'.format(tag))),
                     lambda match: r'<{}{}>{}</{}>'.format(
                         tag,
                         ' ' + ' '.join(attrs) if attrs else '',
@@ skipping 323 matching lines @@
             stack[-1]['subitems'].append(item)
             stack.append(item)
         return structured
 
 
 converters = {
     'html': RawConverter,
     'md': MarkdownConverter,
     'tmpl': TemplateConverter,
 }