code: public static String substringAfter(String value, char delim) {
          int pos = value.indexOf(delim);
          if (pos >= 0) {
              return value.substring(pos + 1);
          }
          return null;
      }
docs: Get the item after one char delim if the delim is found (else null).
  This operation is a simplified and optimized
  version of {@link String#split(String, int)}.