the-bastion/bin/plugin/open/groupListServers.json

{
    "interactive": [
        "groupListServers"                            ,  {"ac" :  ["--group"]},
        "groupListServers --group"                    ,  {"ac" :  ["<GROUP>"]},
        "groupListServers --group \\S+"               ,  {"ac" :  ["<enter>", "--reverse-dns"]},
        "groupListServers --group \\S+ --reverse-dns" ,  {"pr" :  ["<enter>"]}
    ]
}