this regular expression does not look right to me.
here is an example of a regular expression for a password enforcing 6-8 alpha numeric characters with at least one number:
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.