code: protected int getLastNumPos(final String s) {
          int i = 0;
          for ( ; i < s.length(); i++) {
              if (NUM_CHARS.indexOf(s.charAt(i)) < 0) {
                  break;
              }
          }
          return i - 1;
      }
docs: Returns the pos of the last numeric char in the given string.
  
  @param s the string to parse
  @return the pos