Entry Blocking Rules help

[sierra471]

Hello, I've been having problems getting Entry Blocking Rules to work. Could someone help me as I'm definitely making a mistake some where.

Below is an example rule I've tried and it didn't seem to work. I read on another post the rule doesn't work retrospectively, but I believe this hasn't worked at all. I'm trying to have it filter out any article with (Podcast) in the title.

EntryTitle=(?i)(Podcast)

Thanks in advance.