/
getext() - Get extension.
ret = getext( str )
2022/07/01
2022/06/27
2022/06/24
2022/05/26
2022/05/17
2022/05/02
2022/04/19
2022/02/25
2022/01/13
2021/07/09
2021/07/06
2021/05/26
2021/02/24
2021/02/05
2020/09/04