密码强度

1  强：字母+数字+特殊字符 
2   ^(?![a-zA-z]+$)(?!\d+$)(?![!@#$%^&*]+$)(?![a-zA-z\d]+$)(?![a-zA-z!@#$%^&*]+$)(?![\d!@#$%^&*]+$)[a-zA-Z\d!@#$%^&*]+$
3     
4      
5  中：字母+数字，字母+特殊字符，数字+特殊字符
6  ^(?![a-zA-z]+$)(?!\d+$)(?![!@#$%^&*]+$)[a-zA-Z\d!@#$%^&*]+$
7 
8  弱：纯数字，纯字母，纯特殊字符
9  ^(?:\d+|[a-zA-Z]+|[!@#$%^&*]+)$