bfe_year.py
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	# -- coding: utf-8 --
	##
	## This file is part of CDS Invenio.
	## Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 CERN.
	##
	## CDS 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.
	##
	## CDS 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 CDS 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(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()