From the API page of the script: --replace will replace the characters < , > , ~ , ; , and ` by the characters [,],-,?, and @ in attribute values. This is useful when you do not want roll20 to evaluate your expression in chat before it is parsed by the script. Alternatively, you can use \lbrak, \rbrak, \n, \at, and \ques to create [, ], a newline, @, and ?. You would use this if you were going to insert macro code into a field. You can find more info here: <a href="https://wiki.roll20.net/Chatsetattr" rel="nofollow">https://wiki.roll20.net/Chatsetattr</a>