FIrst off youd need to find the ascii number
Code:
 /ascii { 
  echo Character $+ $chr(9) $+ ASCII value $+ $chr(9) $+ Alt+
  VAR %a = 32 
  WHILE (%a <= 255) { 
    echo $chr(%a) $+ $chr(9) $+ %a $+ $chr(9) $+ $base(%a,10,10,4) 
    INC %a 
  } 
}

Is how I found it
( = 40
) = 41
{ = 123
} = 125
So then youd do $remove(%var,$chr(125))