正则表达式或 if 循环 .... 用于密码验证

Question

I want to validate password in which it should accept

• At least 2 numerical,
• At least 1 upper-case,
• At least 1 lower-case,
• At least 1 symbol.
• And no space.
• Minimum length of password should be 8 characters

Like shown below

• asdA1@#2.
• 1Aas&3%A
• 21asdA@!

Numerical symbols not necessarily have to be together.

It can be anywhere, and separated.

Answer 1

you can use the regex

(?=.*\d.*\d)(?=.*[A-Z])(?=.*[a-z])(?=.*[&@%#!])[^\s]{8,}

see the regex101 demo

Answer 2

I would split all the conditions to seperated boolean methods, and one validatePassword method that will call all the condition methods, without regex. code should be readable and easy to maintenance.

Tommorow you might want to change something in the conditions, it will be hard to change the regex and you will have to test all the schenarios over again.