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regular expressions? Any decent text editor should have them. But with text editor you could either just find the hashtags, or do the “replace text” with a regular expression that matches everything that is not a hashtag, and replaces it with nothing.
If you are willing to use command line, you could copy the contents of the article into a text file and then use
grepcommand in combination with regular expression that does match hashtags. That would get you a proper list.Sorry, I mean, given a text get the hashtags appropriate to use with the text.
Keyword extraction, AI summarization. Those phrases might get you started.
Maybe changing your title’s “extract” to “deduce” or something like that will avoid this confusion, so that it’s more likely that you get the answer that you’re looking for :)