Modified nickname validity check. Now uses regexp defined at beginning of module (sre_invalid_nickname). Nicknames cannot contain ',@ characters or begin/end with whitespaces. This could also be the usage for group names.
Modified nickname validity check. Now uses regexp defined at beginning of module (sre_invalid_nickname). Nicknames cannot contain ',@ characters or begin/end with whitespaces. This could also be the usage for group names.

inveniosoftware/invenio,inveniosoftware/invenio,tiborsimko/invenio,tiborsimko/invenio