docs: public static boolean isEmail(final String string) {
          if (StringUtils.isBlank(string)) {
              return false;
          }
  
          if (MAX_EMAIL_LENGTH < string.length()) {
              return false;
          }
  
          final String[] parts = string.split("@");
  
          if (2 != parts.length) {
              return false;
          }
  
          final String local = parts[0];
  
          if (MAX_EMAIL_LENGTH_LOCAL < local.length()) {
              return false;
          }
  
          final String domain = parts[1];
  
          if (MAX_EMAIL_LENGTH_DOMAIN < domain.length()) {
              return false;
          }
  
          return EMAIL_PATTERN.matcher(string).matches();
      }