You contradicted yourself there...

A password should be allowed to be strong... If the person knows how to form unicode characters (and I doubt it), they can use it in their password, can't they?

I honestly don't care if the password is an insane 50 character unicode mess (unless if they can accidentally form unicode characters and scew something up).

Also, from the top, I said it only disallows whitespace and quotation marks. Where did I say only alphanumeric?

1) Whats with the tildes?
2) What is the D pattern modifier and how do I incorporate it into that regex?

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Signatures are nothing but incriminating.