Did your regex get munged there? \f (form feed) is something I've never come across (well maybe back in BBC basic?) - what's the context of removing it/them (I'

Did your regex get munged there? \f (form feed) is something I've never come across (well maybe back in BBC basic?) - what's the context of removing it/them (I'm guessing only pairs \f\f) from 7M files?