bfe_year.py
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	# -- coding: utf-8 --
	#
	# This file is part of Invenio.
	# Copyright (C) 2007, 2008, 2009, 2010, 2011 CERN.
	#
	# Invenio is free software; you can redistribute it and/or
	# modify it under the terms of the GNU General Public License as
	# published by the Free Software Foundation; either version 2 of the
	# License, or (at your option) any later version.
	#
	# Invenio 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
	# General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with Invenio; if not, write to the Free Software Foundation, Inc.,
	# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
	"""BibFormat element - Prints the publication year
	"""
	__revision__ = "$Id$"

	import re

	def format_element(bfo):
	"""
	Prints the publication year.
	@see: pagination.py, publisher.py, reprints.py, imprint.py, place.py
	"""
	for date_field in ['773__y', '260__c', '269__c', '909C4y', '925__a']:
	date = bfo.field(date_field)
	match_obj = re.search('\d\d\d\d', date)
	if match_obj is not None:
	return match_obj.group()