Operating System Identification v2 doesn't work with zabbix-agent2

[Luan Vitor Simião Oliveira]

all the discovered itens fail with the following error when the host is monitored using zabbix-agent2:

item "Zabbix server:vfs.file.regexp["/etc/os-release","^NAME=(?P<quote>[\"']?)(?P<value>[\S\s]*?)(?P=quote)($|\s)",,,,\2]" became not supported: Invalid first parameter.