Password validation regex

/^((?=\S*?[A-Z])(?=\S*?[a-z])(?=\S*?[0-9])(?=\S*?(?:\W|_)).{8,})$/g

Password requirements:
- Contains at least one uppercase letter.
- Contains at least one lowercase letter.
- Contains at least one digit.
- Does not contain any whitespace characters.
- Has a minimum length of 8 characters.