private static IDataValidator getSecurtityIdValidator() {
        return new DataValidator() {

            @Override
            public boolean validate(int columnIndex, int rowIndex, Object newValue) {
                boolean valid = false;

                if (newValue != null) {
                    String value = (String) newValue;
                    if (value.length() > 3) {
                        String alphabeticPart = value.substring(0, 2);
                        String numericPart = value.substring(3, value.length());
                        valid = isAlpha(alphabeticPart)
                                && isNumeric(numericPart);
                    } else {
                        String alphabeticPart = value.substring(0, value.length());
                        valid = isAlpha(alphabeticPart);
                    }
                }

                if (!valid) {
                    throw new ValidationFailedException("Security Id must be 3 alpha characters optionally followed by numbers");
                }

                return valid;
            }

            private boolean isAlpha(String str) {
                for (int i = 0; i < str.length(); i++) {
                    if (!Character.isLetter(str.charAt(i)))
                        return false;
                }
                return true;
            }

            private boolean isNumeric(String str) {
                for (int i = 0; i < str.length(); i++) {
                    if (!Character.isDigit(str.charAt(i)))
                        return false;
                }
                return true;
            }
        };
    }