How to use regexp filters for Connector? ( for =NUM > 5)

Generic: Is there a list of commonly used regexp codes to search for data in Salesforce?

Specific: I want to use Excel Connector's regexp option to find Zip codes with length characters greater than 5. This will allow me to remove the Zip Plus 4's that mess up our workflows.

(And I'm trying to do this without adding a new field to calculate LEN)