Password validation regex

Question

I am trying to get one regular expression that does the following:

1. makes sure there are no white-space characters
2. minimum length of 8
3. makes s

Answer 1

Tim's answer works well, and is a good reminder that there are many ways to solve the same problem with regexes, but you were on the right track to finding a solution yourself. If you had changed (?!\s) to (?!.*\s) and added the ^ and $ anchors to the end, it would work.

^((?=.*[^a-zA-Z])(?=.*[a-z])(?=.*[A-Z])(?!.*\s).{8,})$