docs: public static boolean containsIgnoreCase(String pString, int pChar) {
          return ((pString != null)
                  && ((pString.indexOf(Character.toLowerCase((char) pChar)) >= 0)
                  || (pString.indexOf(Character.toUpperCase((char) pChar)) >= 0)));
  
          // NOTE: I don't convert the  string to uppercase, but instead test
          // the string (potentially) two times, as this is more efficient for
          // long strings (in most cases).
      }