Reply To: GREP style formatting suppression

To make text disappear, add a character style and name it e.g. ‘hide’. Set the point size to 0.1 and the horizontal scale to 1%. And for good measure set the colour to Paper. Then define two GREP styles in the paragraph style(s) using the ‘hide character style:

^\[E\d:
^.+?\]

The first one hides [E1:, [E2:, etc, the second one hides the first bracket in the paragraph. This assumes that the first ] in every paragraph is the closing bracket of the code.

As to conditional formatting, you could look into conditional text if you want to maintain two texts in one document.