Regex to enforce password pattern

(?=^.{6,}$)((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[a-zA-Z]).*$

This regex will validate if:

• password has at least 6 chars
• contains at least 1 numeric digit
• contains at least 1 character (uppercase OR lowercase

Nice piece of regex found on http://www.arjones.net/