Regular expressions for password validation

Question

I need to validate a password that matches the following criteria:

• minimum 8 characters
• contain a combination of numbers and letters
• must not

Answer 1

Try:

^(?=.*\d)(?=.*[a-zA-Z]).{8,}$

See it @work

Answer 2

simple not most efficient way:

^[a-zA-Z0-9!.-_]{8,}$

Replace !.-_ with the list of special characters you'd like to allow