Regular Expression help needed

I am trying to validate a password by using a regex.

* Must be between 6 to 16 characters long
* Must contain atleast 1 uppercase letter
* Must contain atleast 1 lowercase letter
* Must contain atleast 1 numeric "digit"

So far so good ...

Code:

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(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{6,16})$

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* I am stuck here! Can optionally have any number of special characters listed below

Code:

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! @ $ - _ .

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Any help would be greatly appreciated.

Cheers :)

No one?

Never been too good with RegEx, but with all those conditions, maybe a nested IF structure would be better. It would allow you to narrow down to the reason the password condition wasn't met. With a single Regex, all you'll be able to do is "if regex=met then good, else not good". That doesn't tell you WHY it failed though.