It's funny but this was pointed out to me only last week:

You are expecting the epub to look exactly look like you made your InDesign document.

Now that's wrong

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.

Yes. Use GREP!

(The regular Search-and-Replace will mess up your paragraph styles, because it will temporarily merge two paragraph into one, before inserting a paragraph return again.)

Search for this:

(?<=r)r+

and replace with nothing-at-all.

Well, one one level the combinations are endless — Newton's Gravitational Constant, g, for example, is defined in cubed meters per grams per seconds squared, or m³/gs² — but given a few constraints, you could use the metric system of optional prefix and required unit to your advantage:

d+s?(([pnμmcdkMG]?[gmL])(/([pnμmcdkMG]?[gmL]))*)

This is, from left to right,

any number of digits (but no fractions allowed)

no or only one kind of white space (this was missing in your own attempt)

nothing, or one of the pico, nano, micro, milli, centi, deci, kilo, mega, or giga prefixes

g for grams or L for Liter or m for meter

zero or umpteen of the following group:

{ a slash

followed by (again) a prefix and a unit. }

This misses the minute (min) in your example, but then again that's not an official SI unit :P

After being bitten by the Remember Folders “feature” for the one-thousandstst time, wouldn't it be nice to be able to tell InDesign that

from now on I want to work (import, save, export, package, place, and whatnot) from/in this folder

'Cause boy it's getting old that, once again, I create a Book file in the wrong folder, and after moving it to the correct one and want to add documents to it InDesign jumps back to yet another old folder. AAARGHH!

Do you have the latest version?

I just downloaded it — cor! what a fantastic script — and amongst the multitude of options in the opening dialog, I can also see “Highlight Sundays”. When checked, sundays are colored with a swatch “cal_sunday”, which is defined in its own paragraph style “cal_sunday” as well. It appears Scott Selberg thought of everything.

Ah — sorry, I misunderstood. I thought you were referring to something like e^1+x² — with that second x² with a superior 2 as well, making it “double-superior”.

The only way to get what you need, a superior character on top of an inferior, you have to decrease the space between them. I rarely need that, so I make do with a manual trick: put the cursor between the two and press Alt+Left arrow, decreasing the kerning between them by eye until it looks good. Sorry, I don't know of an automated or styled trick for this.