suppression filter regex

I've been trying to use a regular expression to suppress various checkstyle javadoc modules for all files *except* ones that are in an api package. I've tested the following regex with some online java regex testing applets and it seems to work there but I cannot get it to work when I run checkstyle the suppression filter looks like this:

      <suppress checks="JavadocType" files="^([^a]|a[^p]|ap[^i])*$" />

Does anyone know a way to suppress modules for every file except ones that match a given pattern (in other words, only apply to files that match the pattern). This is pretty much the opposite of what the suppression filter does normally.

-- Ben

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