Using Snort to find creditcard data?

[email protected]
Newsgroups gmane.comp.security.ids
Message-ID <[email protected]>
Would it be possible to write a Snort rule that triggers on possible creditcard numbers and how would it look like?
PCI standars says that all creditcard data should be encrypted, It woild be nice to verify that no card data shows up where it shouldn't...

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