Reply To: GREP styles: Overriding already applied character styles

Manually applied character styles trump everything automated, even GREP styles. (Manual formatting trumps a character style again — that'll always win out.)

GREP styles do have a unique property, though: they get applied over existing character styles, and do not “wipe out” the ones that already are there. Perhaps that's your mistake: if you need to 'cancel out' a style, you need to actually set the reverse in a new character style and apply that on top of the exsiting one. For instance, if you apply “Underline” with a GREP style, it's not enough to draw over it with a GREP style, you need to explicitly set “Underline: Off” in that new one.