Intercept based on byte length

 const toLongStr = item.value.replace(/[^x00-xFF]/g, "**");
                if (toLongStr.length > 30) {
    
                  let num = 0;
                  for (let i = 0; i < 30; i++) {
    
                    if (toLongStr.indexOf("*", i)) {
    
                      num++;
                    }
                  }
                  item.toLongStr = item.value.substr(0, 30 - num / 2);
                  item.toLong = true;
                } else {
    
                  item.toLong = false;
                }