code: public static Status cpe(String value) {
          if ("cpe:2.3:".regionMatches(0, value, 0, 8)) {
              return formattedString(value);
          }
          return cpeUri(value);
      }
docs: Validates the given CPE string value to ensure it is either a valid CPE
  URI or Formatted String.
  
  @param value the CPE to validate
  @return the validation status given value;
  @see us.springett.parsers.cpe.util.Status#isValid()