Regular expression for complex password

Question

I need to validate passwords that needs to fulfill the following rules:

• Minimum length is 8 characters
• All characters need to be unique
• At least one of the characters is capitalized
• At least one character is a non-alphabetic character, a digit or a hyphen
• Non-alphabetic characters should not be placed as the first two or last two characters

I can't figure out how to validate this using regular expressions. Can anybody help me?

Answer 1

^(?=.*[A-Z])(?=.*(?:\d|-))(?!.*(.).*\1)[a-zA-Z]{2}.{4,}[a-zA-Z]{2}$

Try this.See demo.

https://regex101.com/r/eZ0yP4/12

As you can see step by step all conditions are met with the help of lookahead.

(?=.*[A-Z])===at least one Capital

(?=.*(?:\d|-))===at least one digit or -

(?!.*(.).*\1)=== no duplicates

[a-zA-Z]{2}.{4,}[a-zA-Z]{2}===alphabetic characters as first two and last two.