You can now search instagram posts by Captions
Now search this caption with this method
it’s a good method to reach out to your targeted audience , Hope this helps
thanks
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If you want to make it even more accurate you can do site:instagram.com/p/ (as it’s suppose to be a post)
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nice share, thank you for that 
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Interesting as all the google query, anybody know if its possible also filter by follower number (example less than 4k followers) and add to this a bio filter by words?
A good combination of these filter will help a lot the scrape of the account without API calls.
Hmm, I wonder if it’s possible to do same to find profiles with a specific bio, instead of a posts with a specific caption!