src/main/java/org/jinstagram/utils/Preconditions.java
public static void checkValidLatLong(String latOrLong, String errorMsg) {
		checkEmptyString(latOrLong, errorMsg);
		check(isLatLong(latOrLong), errorMsg);
	}
public static void checkValidLatLong(String latOrLong, String errorMsg) {
		checkEmptyString(latOrLong, errorMsg);
		check(isLatLong(latOrLong), errorMsg);
	}
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