your initial question was:
the regular expression i gave was for the server validation on the registration page.
it was not intended to be used for the jquery regular expression which you said was already working.
the questions I answered where for registration not for login, you did not ask initially about login, so i am unclear why you are directing me to try the login page?
that's quite melodramatic
the jquery regular expression for Upper, Lower one Number, minimum of 8 characters is:
The same regular expression cannot be used in Server validation though, as it uses a different regular expression engine.