code: public static void checkValidLatLong(String latOrLong, String errorMsg) {
  		checkEmptyString(latOrLong, errorMsg);
  		check(isLatLong(latOrLong), errorMsg);
  	}
docs: Checks that a string is a valid longitude or latitude value ('lat' and 'lng')
  as shown in <a href="http://instagram.com/developer/realtime/">Instagram Developer real time section</a>
  
  @param latOrLong any string
  @param errorMsg error message