at least 8 chars
combine 3 category: digits + chars + special chars

digits
--
year 1911 1997
birth 0911 1010
phone number 0928 0911

chars
--
abcd
ilovemycountry
john
tom
love

special chars
--
@TW 
1+1=2 
100% 
#1 
$100 
9.99 
2>1

name=PinYinCP