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-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{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}$

来源：https://www.cnblogs.com/gigi2653/p/12427636.html