Regex to match a minimum of 1 special character

Question

I have the following regex that requires 1 number, 1 letter upper and 1 letter lower (w/ a minimum of 8 length)

Regex.IsMatch(password, "^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).{8,}$")

I need to add another filter to ensure one of the following special characters is present (any help?)

#, $, @, !, %, &, * ?

Answer 1

Simple!:

Regex.IsMatch(Password,"[#$@!%&*?]");

Answer 2

How about this? [#$@!%&*?]

Answer 3

Regex.IsMatch(password, "^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[#$@!%&*?]).{8,}$")