I created this after the user ikwyl6 wanted a quick way to filter the buflist
/set buflist.look.display_conditions "${eval_cond:${plugins.var.buflist_conditions}} && ${buffer.hidden}==0"
/alias add search_buflist /set plugins.var.buflist_conditions $1-;/buflist refresh
/alias add search_bufname /search_buflist ${channel}=~$1
exemples