If that pattern is valid for all files, this should work:
=regex([Name],/#(.+?)\s*-\s*\d+\s*(.+)#/,-1)[R1] - [R2]
You could instead use the "Fill Properties From Filename" tool to fill in the [Season], [Episode] and [Name] fields, then use that info to rename the files. This way you could do a Get Movie&TV Info too.
On the F12 tool, use a rule like:
S[Season]E[Episode] - [] [Name]