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							'''
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							searx is free software: you can redistribute it and/or modify
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							it under the terms of the GNU Affero General Public License as published by
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							the Free Software Foundation, either version 3 of the License, or
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							(at your option) any later version.
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							searx is distributed in the hope that it will be useful,
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							but WITHOUT ANY WARRANTY; without even the implied warranty of
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							MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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							GNU Affero General Public License for more details.
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							You should have received a copy of the GNU Affero General Public License
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							along with searx. If not, see < http://www.gnu.org/licenses/ >.
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							(C) 2015 by Adam Tauber, <asciimoo@gmail.com>
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							'''
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							from flask_babel import gettext
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							import re
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							from searx.url_utils import urlunparse
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							regexes = {re.compile(r'utm_[^&]+&?'),
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							           re.compile(r'(wkey|wemail)[^&]+&?'),
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							           re.compile(r'&$')}
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							name = gettext('Tracker URL remover')
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							description = gettext('Remove trackers arguments from the returned URL')
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							default_on = True
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							def on_result(request, search, result):
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							    query = result['parsed_url'].query
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							    if query == "":
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							        return True
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							    for reg in regexes:
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							        query = reg.sub('', query)
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							    if query != result['parsed_url'].query:
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							        result['parsed_url'] = result['parsed_url']._replace(query=query)
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							        result['url'] = urlunparse(result['parsed_url'])
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							    return True
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