Regular Expression - determining string length in combination with other properties

I'm new to regular expressions and am trying to create an expression to validate password complexity.  Below I've listed the password requirements:

1.  No white space.
2.  At least one lowercase letter
3.  At least one uppercase letter
4.  At least one digit
5   At least one non-alphanumeric character
6.  At least eight characters long

The regular expression below checks requirements 1 through 5 but I can't seem to figure out how to add number 6 - the length.  

\s{0}\p{Ll}{1,}\p{Lu}{1,}\d{1,}\W{1,}

I'm sure this is trivial for you mavens.

Thanks,

John C. ChristensenStart Free Trial