I'm looking for grammar errors in articles. I found this example: break-ins.Exterior

I'm told there are more like that so I wanted to try DBr to fox them.

This regular expression did not work to find that instance of a period without 2 spaces afterward:
\.(?![ ]{2})

I get the error: The database query is invalid. Try changing the search.

WWhat am I going wrong?

Still get the same error.

https://www.dropbox.com/s/ghvpjeygec7qgpw/Screenshot%202023-06-05%20at%203.18.35%20PM.png?dl=0

I want to find all instances of a . without 2 spaced after it and add in the 2 spaces.

Its an older client that prefers 2 spaces after a period. If you learned to type on a typewriter, 2 spaces was the norm.

Thanks for your help.