Reply To: Superscript with underline

This isn’t possible with grep, cause as I described above, if you use percentages, you will get
a) no correct value
b) percentages are converted to mm or pt
c) only values in () are dynamic and doesn’t help in your case

As I said above: You will not have those problems, if you choose a font with a glyph-set that can display correct ordinals.
Otherwise it is good practice, not to underline everything. So it should not be that problem, to create one character style for body text with my above mentioned steps. An yes, you can then includ this style with a grepstyle to your para style, e.g. (\d\Kth)

Kai