D-Net

def resolveIdentifier(pid, pid_type):

    if pid_type != None:

        regex = r"\b(10[.][0-9]{4,}(?:[.][0-9]+)*/(?:(?![\"&\'<>])\S)+)\b"

        if re.match(regex,pid):

            print "It should be doi"

        if pid_type.lower() in pid_resolver:

            return pid_resolver[pid_type.lower()] % pid

        else:

            if pid_type.lower() == 'openaire':

                return "https://www.openaire.eu/search/publication?articleId=%s" % pid.replace('oai:dnet:', '')

            else:

                return "http://identifiers.org/%s:%s" % (pid_type, pid)

    return ""