Can I filter by "EndsWith" on PageName?

I'm using:

SearchClient.Instance.UnifiedSearch().For(searchQ)

as the basis for my search, afterwhich I've a bunch of filters I've already implented, but now I need to filter pages OUT that have a PageName that ends with "_Compare"...

I tried using "MatchContainedCaseInsensitive" like soo...

.Filter(x => !((PageData) x).PageName.MatchContainedCaseInsensitive(c => c.ToString(),"_Compare"));

but "c.ToString()" is wrong I think and I dont know what is the correct thing to put in there as "fieldSelector" as I've already selected "pagename".

Any help would be great please.