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Marty Y. ChangMarty Y. Chang 

how to get the set of hashtags used in a Chatter post/comment

Does anyone know how to get a Set<String> of all hashtags used in a Chatter post or comment?

Best Answer chosen by Admin (Salesforce Developers) 
Marty Y. ChangMarty Y. Chang

This expression seems to work for me:

Pattern hashtagPattern = Pattern.compile('\\B#[a-zA-Z][a-zA-Z0-9]+');