正则表达式

大写+小写+数字
^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[^]{8,16}$

大写+小写+特殊字符

^(?=.*[A-Za-z])(?=.*[$@$!%*#?&])[A-Za-z$@$!%*#?&]{8,16}$

大写+数字+特殊字符
^(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*#?&])[A-Z\d$@$!%*#?&]{8,16}$

小写+数字+特殊字符
^(?=.*[a-z])(?=.*\d)(?=.*[$@$!%*#?&])[a-z\d$@$!%*#?&]{8,16}$

字母+数字+特殊字符
^(?=.*[A-Za-z])(?=.*\d)(?=.*[$@$!%*#?&])[A-Za-z\d$@$!%*#?&]{8,16}$