I download radio programmes to my phone, via windows pc, to listen to in the gym.  Many of the items I listen to are on Radio 4 which are then repeated on Radio 4 Extra the following week.  If I create a pvr search using channel="BBC Radio 4", then it also picks up the Radio 4 Extra programme, duplicating the previous week's download.  Is there a way to limit the search to Radio 4 only?

Read the Searching section of examples page in wiki

Thanks for the quick response. I missed it when I looked there originally. It too me some time to find it, but I did eventually.