Trending Words Help

I am trying to have my app display trending terms, ie display the most common text posted by users, but I need help figuring out how to do this.

My idea would be to have a page with a repeating group that searches for these common terms from user’s posts (names, words, etc.) but I need help in making the search extract these words from the text that users have posted.

I imagine it would have to be some sort of extract with regex that extracts words only if these words were also found in other posts…then the other problem is what if a lot of posts feature a name, so like joe smith for example, how would the extraction work when searching for two words or a full name that are together, or for example, a city’s name like new york city?

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