I don't have a direct answer but here's a query that we're using to find all members of a particular filter now that we can't "copy to clipboard" for filters:
SELECT
vComputer.Guid,
vComputer.Name,
vComputer.[OS Name],
vComputer.[IsManaged],
vCollection.Name AS Filter
FROM CollectionMembership INNER JOIN
vComputer ON CollectionMembership.ResourceGuid = vComputer.Guid INNER JOIN
vCollection INNER JOIN
Collection ON vCollection.Guid = Collection.Guid ON CollectionMembership.CollectionGuid = Collection.Guid
where vCollection.Name LIKE '%COLLECTION_NAME_GOES_HERE%'
order by vCollection.Name, vComputer.[OS Name], vComputer.Name ASC
Does this help?