old_contents: from flask_babel import gettext
  import re
  from searx.url_utils import urlparse, parse_qsl
  from searx import settings
  
  
  regex = re.compile(r'10\.\d{4,9}/[^\s]+')
  
  name = gettext('Open Access DOI rewrite')
  description = gettext('Avoid paywalls by redirecting to open-access versions of publications when available')
  default_on = False
  preference_section = 'privacy'
  
  doi_resolvers = settings['doi_resolvers']
  
  
  def extract_doi(url):
      match = regex.search(url.path)
      if match:
          return match.group(0)
      for _, v in parse_qsl(url.query):
          match = regex.search(v)
          if match:
              return match.group(0)
      return None
  
  
  def get_doi_resolver(args, preference_doi_resolver):
      doi_resolvers = settings['doi_resolvers']
      doi_resolver = args.get('doi_resolver', preference_doi_resolver)[0]
      if doi_resolver not in doi_resolvers:
          doi_resolvers = settings['default_doi_resolver']
      doi_resolver_url =  doi_resolvers[doi_resolver]
      return doi_resolver_url
  
  
  def on_result(request, search, result):
      doi = extract_doi(result['parsed_url'])
      if doi and len(doi) < 50:
          for suffix in ('/', '.pdf', '/full', '/meta', '/abstract'):
              if doi.endswith(suffix):
                  doi = doi[:-len(suffix)]
          result['url'] = get_doi_resolver(request.args, request.preferences.get_value('doi_resolver')) + doi
          result['parsed_url'] = urlparse(result['url'])
      return True
  
new_contents: from flask_babel import gettext
  import re
  from searx.url_utils import urlparse, parse_qsl
  from searx import settings
  
  
  regex = re.compile(r'10\.\d{4,9}/[^\s]+')
  
  name = gettext('Open Access DOI rewrite')
  description = gettext('Avoid paywalls by redirecting to open-access versions of publications when available')
  default_on = False
  preference_section = 'privacy'
  
  doi_resolvers = settings['doi_resolvers']
  
  
  def extract_doi(url):
      match = regex.search(url.path)
      if match:
          return match.group(0)
      for _, v in parse_qsl(url.query):
          match = regex.search(v)
          if match:
              return match.group(0)
      return None
  
  
  def get_doi_resolver(args, preference_doi_resolver):
      doi_resolvers = settings['doi_resolvers']
      doi_resolver = args.get('doi_resolver', preference_doi_resolver)[0]
      if doi_resolver not in doi_resolvers:
          doi_resolvers = settings['default_doi_resolver']
      doi_resolver_url = doi_resolvers[doi_resolver]
      return doi_resolver_url
  
  
  def on_result(request, search, result):
      doi = extract_doi(result['parsed_url'])
      if doi and len(doi) < 50:
          for suffix in ('/', '.pdf', '/full', '/meta', '/abstract'):
              if doi.endswith(suffix):
                  doi = doi[:-len(suffix)]
          result['url'] = get_doi_resolver(request.args, request.preferences.get_value('doi_resolver')) + doi
          result['parsed_url'] = urlparse(result['url'])
      return True
  
subject: remove double spaces