Is it possible to check letters style within a cell one by one, at least part by part

[fyy623]

title.

I want to filter my cells by only keeping letters that do not have a strike through.

I see that there a cell.font attribute, but it does not go down to letter level.

I have also tried to traverse the content of a cell using cell.value, but it doesn't produce the font attribute either.

The confusion further grows as you may notice in the screenshot below, before the strike through, "Control " is parsed as a str, while after the strike through appear once, its following letters "s Record" is parsed as a rich_text. str does not have a font attribute and therefore this task seems impossible.

is this an expected behavior or a known issue?