How to check if a string contains hashtags in dart?

guys,

I am developing a social media app and I want people to see hashtags and for that, I want to check if a string contains any hashtags like : #I_am_nice.

Notice that I want to get all the hashtag not only the first word after hashtag mark(#).

My wants :

if (string.contains(Hashtag)) {
  print(hashtag);//Hashtag String
 } else {
  //No Hashtags
 }

thanks,