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search.cgi: field not null?

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search.cgi: field not null?
Is there a method of passing a field to search.cgi and returning results based on 'Not Null' or 'Return if not empty'?

The example I'm thinking of is a second field containing a URL to a site's privacy policy, and search.cgi returning all the links with a privacy policy page only, exluding all the others where the field value would be null.

All the best