old_contents: '''
  searx is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  searx 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
  GNU Affero General Public License for more details.
  
  You should have received a copy of the GNU Affero General Public License
  along with searx. If not, see < http://www.gnu.org/licenses/ >.
  
  (C) 2015 by Adam Tauber, <asciimoo@gmail.com>
  '''
  
  from flask.ext.babel import gettext
  import re
  
  regexes = {re.compile(r'utm_[^&]+&?'),
             re.compile(r'(wkey|wemail)[^&]+&?'),
             re.compile(r'&$')}
  
  name = gettext('Tracker URL remover')
  description = gettext('Remove trackers arguments from the returned URL')
  default_on = True
  
  
  def on_result(request, ctx):
      splited_url = ctx['result']['url'].split('?')
  
      if len(splited_url) is not 2:
          return True
  
      for reg in regexes:
          splited_url[1] = reg.sub('', splited_url[1])
  
      if splited_url[1] == "":
          ctx['result']['url'] = splited_url[0]
      else:
          ctx['result']['url'] = splited_url[0] + '?' + splited_url[1]
  
      return True
  
new_contents: '''
  searx is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  searx 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
  GNU Affero General Public License for more details.
  
  You should have received a copy of the GNU Affero General Public License
  along with searx. If not, see < http://www.gnu.org/licenses/ >.
  
  (C) 2015 by Adam Tauber, <asciimoo@gmail.com>
  '''
  
  from flask.ext.babel import gettext
  import re
  from urlparse import urlunparse
  
  regexes = {re.compile(r'utm_[^&]+&?'),
             re.compile(r'(wkey|wemail)[^&]+&?'),
             re.compile(r'&$')}
  
  name = gettext('Tracker URL remover')
  description = gettext('Remove trackers arguments from the returned URL')
  default_on = True
  
  
  def on_result(request, ctx):
      query = ctx['result']['parsed_url'].query
  
      if query == "":
          return True
  
      for reg in regexes:
          query = reg.sub('', query)
  
      if query != ctx['result']['parsed_url'].query:
          ctx['result']['parsed_url'] = ctx['result']['parsed_url']._replace(query=query)
          ctx['result']['url'] = urlunparse(ctx['result']['parsed_url'])
  
      return True
  
subject: Use parsed_url