Becky Katz 

Quite tricky... I can only do this with two expressions.  So for an unpaired opening parentheses try this:

\((?![^()]*\))

Then for an unpaired closing try this:

(?<!\()(\))(?![^(]*\))

Seems to work, but with very limited testing!

Paul 

The opening parenthesys pattern works fine (and I even understand it ), but the closing one does’t work in https://regex101.com/, as it matches the right pairs:

It doesn’t work in Trados Studio either:

Hi dear Paul!

Thanks so much for your help! The expression for unpaired opening parentheses works, since it did find them. 

It also finds some false positives, such as when parentheses are nested within each other but paired correctly. For example: Find your grade (paragraph (b) and (d) in here) where it goes.

I don't think that's a huge problem, since it would just make me double-check the parenths in those segments.

As far as the unpaired closing, I don't think that the regex works all the time. But it's not as essential as the unpaired open. I think that's a more obvious mistake when I'm reviewing text visually. 

As always, thanks so much for your help!

best,

Becky