options:
 highlightcolor: &e
 resetcolor: &7
 sound: true

on chat:
 if message contains "@":
  set {_x} to the text between '@' and ' ' in message
  set {_x} to {_x} parsed as player
  if {_x} is online:
   replace "@%{_x}%" in message with "{@highlightcolor}@%{_x}%{@resetcolor}"
   if {@sound} = true:
    play sound "entity.experience_orb.pickup" with volume 0.1 to {_x}