I experimented with this and found such this solution. Perhaps this method will work for you:
Code
on *:JOIN:#:{
  if ($level($nick) isnum 2-4) {
    .msg $chan Welcome $nick to this channel.
  }
}

Should work only with nicknames that have an access level of 2-4.

You can also do this with addresses. More details here -> https://en.wikichip.org/wiki/mirc/identifiers/$level


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