Dash Plus Sixth Space GREP

.

You might try

\p{Pd}

or

\p{Dash_Punctuation}

Should catch any kind of hyphen or dash.

I think I can help.

Step 1: In your document, select the em-dash (or whatever it is you want to change). Open the Find/Change window, make sure GREP is selected, and paste what you copied into the "Find what:" field.

Step 2: Type the 6th space, Em dash, 6th space in your document, then select this and paste it into the "Change to:" field

Example: FInd/Change em-dash will look like this:

You can save GREP queries, so you can save one for each combination of dashes and spaces that you want to change.

I hope this helps. I'm not a GREP expert, but this does work.