I see two instances in the mapping table where this occurs: `{\\c\\ }` (which wouldn't be matched by this regexp anyway) and `{\\=\\i}` (which is a bit odd. It is listed twice in the reverse mapping table - once with and once without the additional backslash - so it wouldn't matter, but in the forward mapping it is listed only with, which I guess makes sense, though I still don't understand why) So in the end, I guess it doesn't matter