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epgcache.cpp appears to process those characters in a couple of places as well...

https://github.com/OpenViX/enigma2/blob/ea04c8fd3743ee345c5e0dd026a080485512c91b/lib/dvb/epgcache.cpp#L1766

https://github.com/OpenViX/enigma2/blob/ea04c8fd3743ee345c5e0dd026a080485512c91b/lib/dvb/epgcache.cpp#L2561

I think those remove the control characters if they are in the name of the channel.

But maybe they show a slightly neater way of doing it than using replace_all.

it's also not clear to me if these methods are properly aware of character boundaries. There are no comments saying what each routine does.

replace_all looks complicated so I guess it probably is aware of character boundaries, I haven't looked closely at what epgcache does yet.