Faster yet:

on *:text:!*:#:{
  if (!$2) || ($1 == !8ball) {
   var %w $right($1,-1)
    var %file $+($mircdir\text\,%w,.txt)
    if ($isfile(%file)) {
      msg $chan $read(%file)
    }
  }
}

EDIT:
@Hawkee there should be a 'delete post' option when i'm the post owner.
Also, editing "code" tag within an comment will add "br" tags and delete the "code" styling.