Password Policy on forgot password

Hi there, i have a problem, i need to protect user join my site with a complex password 8 character at least 1 lower and one upper, one special character and one number.
Is there any way to do that? i tryed to create a custom page but i can’t modify user password. any suggestion?

Hi all,
I am having the same issue. The initial question is 2 years old now. Is there seriously no fix for this?