new trigger format with advice as cut from 

singalaut-     It won’t work if you have weechat.look.prefix_same_nick set to anything other than empty string. For some reason weechat always prepend the line with prefix_same_nick

/trigger add outdent_own_message modifier "weechat_print" "${nick} == ${tg_tag_nick}" "/^[^\t]+\t(.*)$/\t\t${re:1}/" ""

pre version 1.1

/trigger add outdent_own_message modifier "weechat_print" "${nick} == ${tg_tag_nick}" "/^[^\t]+\t(.*)$/\t\t$1/" ""