@classmethod<EOL><INDENT>def _validate(cls, group_name):<DEDENT>
if group_name and not cls._group_name_regex.match(group_name):<EOL><INDENT>raise ArgumentError("<STR_LIT>" % (group_name,))<EOL><DEDENT>if group_name and len(group_name) > <NUM_LIT:255>:<EOL><INDENT>raise ArgumentError("<STR_LIT>" % (group_name,))<EOL><DEDENT>
Validates the group name
Input values must be strings (standard or unicode).  Throws ArgumentError if any input is invalid
:param group_name: name of group