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


	def util_split(string, separator, index):
	"""
	Helper function to split safely a string and get the
	n-th element

	@param string: String to be split
	@param separator:
	@param index: n-th part of the split string to return

	@return: The n-th part of the string or None in case of error
	"""
	string_splitted = string.split(separator)
	try:
	return string_splitted[index].strip()
	except:
	return ""