Can the rich text fields in Redactor be setup to strip out or replace non-breaking-space tags ( ) with regular spaces?
Apparently we are getting some copy and pasted in from outside sources which then screws up an RSS feed attached these resources.
Not really. I mean, in theory a custom plugin could do that or you could fiddle with the paste filters, but a non-breaking space is valid text.
What I would double check is how you’re generating the RSS feed. If nothing else, you could do a [[+content:replace=` == `]] in there, but typically, rich content like html would be in a CDATA block which should be fine with html entities: [[+content:cdata]].