Validation General Questions

I have a couple of general questions on validation.
1) I have a text field defined as a "Required" field (it is using the form_required template). Must I also create a NOT NULL validation on this field as well? It seems that I should not have to do this. However, if I do not create this NOT NULL validation, then clicking on a Submit button while this field is empty is not generating any error message. But when I include a NOT NULL validation, then I do get an error message.
2) This question is related to the first. I tried creating a regular expression validation on my field in which I use the pattern
[[:alnum:]]{1,}[|$#&_?]+
The field should allow the user to type-in a string consisting of 1 or more alphanumeric characters (it could be a foreign language characters as well)
and 1 or more special characters like $ or #.
I thought this would also generate an error message if the user clicks the Submit button while leaving the field empty. But, again, I get no error message. Why?
Thank you in advance for any insight on this.

Thanks very much, Justin.
When I saw the regexp_like() function in your reply, I am wondering if, perhaps, you might also have some insight into how I can ckeck if a field contains non-English type characters (i.e., mult-byte characters). I already posted a question about this an hour ago but have not gotton any replies as yet. In my post I asked about using the regular expression pattern [[:alnum:]] since the docs state that this will check for mult-byte characters. And so, I thought if perhaps there is some function I might use to return a boolean TRUE if a field contains non-English characters versus a FALSE if it contains only English characters.
Any insight in this would be most appreciated.
Thanks again for your help.

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Message was edited by: BeSharp

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http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/Articles/ch apter13_section_8.html#//appleref/doc/uid/TP30001163-CH9-BAJIGHAF
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