Business Rules evaluating Repeating Record

Hello and thanks for any assistance. With the Schema below i need to
create a business rule where I evaluate the LineItems Id and if none
of them begins with any lower\upper case combination of "NT" (ie:
'nT', 'nt', 'Nt' or 'NT'), then the evaluation will result in TRUE.

I can get this rule working if only 1 lineItem exists and the Id is
within any combination of 'NT", however as soon as I have more then 1
line item and one of them is not based on that criteria it always
evaluates to true, (which is incorrect based on what i'm looking
for). [This is done my using the 'contains' predicate with the
following regular expression ^(?![Nn][Tt]).*]

Do you know how to evaluate all instances of a repeating field in a
passed in message and have the action evaluate to 'False' if anyone of
those repeating fields begins with 'NT'

<SalesOrder Status="NewOrder">

<LineItems>

<LineItem Id="SC0001" Name="Blah" />

<LineItem Id="NT001" Name="notBlah" />

</LineItems>

</SalesOrder>

Thanks, I really appreciate any help.

Steven

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