How to search a word that is a empty brackets

We have some logs with barckets, like “2019-09-27 12:00:00 jobs running at ”.

So we want to search the word that is a empty brackets ,
like this:
and I tried many way to search it including regular expression, but all failed,

please let me know if anybody has solution~~

did you “escape” your search?

I search with // and “” , both way is NG


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