Can someone help me with the code I can use to extract word preceded by hash tag in live tweets download from twitteR.
An example of what I require is:
[[9]]
[1] "HollandUKTrade: #Dutch companies striking Olympic gold at London 2012 http://t.co/XsvvXAzT #london2012 #olympics #sport @hollandtrade @dutchembassyUK"  (Tweet download)

I want a code that will extract this:
#Dutch companies #london2012, #olympics, #sport

I have used the under-listed code in Stringr which return these outputs I did not require:
> str_extract_all("#<-a-z, #<-A-Z", "[[string1:string10]]") [[1]]
character(0)
> str_extract_all("#<-a-z, #<-A-Z", "[[string9]]") [[1]]
character(0)

> str_extract_all("#=[1:10]", "#+a-z") [[1]]
character(0) 
str_extract_all("#=[1:10]", "#+") [[1]]
[1] "#" 

Positive help will be highly appreciated.
Mariam
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