function IsHKID(str) { var strValidChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" // basic check length if (str.length < 8) return false; // handling bracket if (str.charAt(str.length-3) == '(' && str.charAt(str.length-1) == ')') str = str.substring(0, str.length - 3) + str.charAt(str.length -2); // convert to upper case str = str.toUpperCase(); // regular expression to check pattern and split var hkidPat = /^([A-Z]{1,2})([0-9]{6})([A0-9])$/; var matchArray = str.match(hkidPat); // not match, return false if (matchArray == null) return false; // the character part, numeric part and check digit part var charPart = matchArray[1]; var numPart = matchArray[2]; var checkDigit = matchArray[3]; // calculate the checksum for character part var checkSum = 0; if (charPart.length == 2) { checkSum += 9 * (10 + strValidChars.indexOf(charPart.charAt(0))); checkSum += 8 * (10 + strValidChars.indexOf(charPart.charAt(1))); } else { checkSum += 9 * 36; checkSum += 8 * (10 + strValidChars.indexOf(charPart)); } // calculate the checksum for numeric part for (var i = 0, j = 7; i < numPart.length; i++, j--) checkSum += j * numPart.charAt(i); // verify the check digit var remaining = checkSum % 11; var verify = remaining == 0 ? 0 : 11 - remaining; return verify == checkDigit || (verify == 10 && checkDigit == 'A');}

function IsHKID(str) { var strValidChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" // basic check length if (str.length < 8) return false; // handling bracket if (str.charAt(str.length-3) == '(' && str.charAt(str.length-1) == ')') str = str.substring(0, str.length - 3) + str.charAt(str.length -2); // convert to upper case str = str.toUpperCase(); // regular expression to check pattern and split var hkidPat = /^([A-Z]{1,2})([0-9]{6})([A0-9])$/; var matchArray = str.match(hkidPat); // not match, return false if (matchArray == null) return false; return true; }