using regex for password validation

[Sadaka Technology]

hello guys,

I have this pattern for password validation (regex):

I want these rules to be applied:

Minimum 8 characters.
The alphabets must be between [a-z]
At least one alphabet should be of Upper Case [A-Z]
At least 1 number or digit between [0-9].
At least 1 character from [ _ or @ or $ ].

and this pattern:

passwordpattern = "^(?=.[a-z])(?=.[A-Z])(?=.\d)(?=.[@$])[A-Za-z\d@$!%?&]{8,}.$"

my only issue is that I want to add the symbol () and symbol(.) in the pattern where only it accepts $ and @, I tried adding generally like [@_$] not working