Hello All,
Can anyone help me solve this problem.
Am trying to extract hash-tagged words from tweets downloaded from twitteR.

I can extract hash-tagged words from single tweet using (stringr) str_extract_all(tweets, "#[a-z//A-Z//0-9]+") 
but cannot with more than one tweet at a time except I manually remove all regular expressions and tweets numbers such as [[1]] and [1.]

I want to automatically extract all #words in large number of tweets at a go.
This is what I have done so far by removing all regular expressions manually:

> searchTwitter("#Portsmouth", n=20) [[1]]
[1] "marymaryw: Get an insight into how journalists operate at The News by following #dayatthenews today #pompeyhacks #portsmouth #southsea"
[[2]]
[1] "VouchAR_Ports: Ł5 instead of Ł60 for 1 month of unlimited fitness classes at Outdoor Fitness Leeds - get bikini... http://t.co/BUrkjtCh #Portsmouth"
[[3]]
[1] "BillieRaePhoto: RT @vintagesecret: My dad has just sent me this picture. Looks like @GunwharfQuays is on fire?! #portsmouth http://t.co/HbAV7Hw0"
[[4]]
[1] "xangma: RT @vintagesecret: My dad has just sent me this picture. Looks like @GunwharfQuays is on fire?! #portsmouth http://t.co/HbAV7Hw0"
[[5]]
[1] "vintagesecret: My dad has just sent me this picture. Looks like @GunwharfQuays is on fire?! #portsmouth http://t.co/HbAV7Hw0"
[[6]]
[1] "i_amnik: RT @BBCRadioSolent: Can you see the #GunwharfQuays fire? Eye-witnesses please call - 0845 30 30 961. #Portsmouth."
[[7]]
[1] "vickiredmond: RT @dan_germain: RT @MatMacAulay: Best pic of #Gunwharf on fire I have seen http://t.co/8LNAiqiD #portsmouth"
[[8]]
[1] "EmilieRosa: Highs of 25 degrees on the island this week!! Beach time after exams I think! ;) #Portsmouth"
[[9]]
[1] "MrYiff: RT @dan_germain: RT @MatMacAulay: Best pic of #Gunwharf on fire I have seen http://t.co/8LNAiqiD #portsmouth"
[[10]]
[1] "otbsaad: RT @BBCRadioSolent: BREAKING NEWS - Reports of a large fire at #GunwharfQuays in #Portsmouth. Latest updates on @BBCRadioSolent 96.1FM"
[[11]]
[1] "PN_Newsdesk: #Portsmouth: Ferryspeed looks to build on its past successes http://t.co/CmDglDkg"
[[12]]
[1] "PN_Newsdesk: #Portsmouth: More room for stalls at top Southsea school - A SOUTHSEA primary school still has room for people to se... http://t.co/ucbYWjPR"
[[13]]
[1] "VouchAR_Ports: Ł14 instead of Ł30 for a pedicure with foiled transfer at Forever Young, Stoke-on-Trent - get... http://t.co/P7gJBcl8 #Portsmouth"
[[14]]
[1] "TelArnott: Looking forward to #K1 today! #gym01 #portsmouth"
[[15]]
[1] "dan_germain: RT @MatMacAulay: Best pic of #Gunwharf on fire I have seen http://t.co/8LNAiqiD #portsmouth"
[[16]]
[1] "dan_germain: RT @portsmouthnews: News: Large fire at Gunwharf Quays - http://t.co/s9RWpY0i #portsmouth #southsea"
[[17]]
[1] "i_amnik: RT @BBCRadioSolent: BREAKING NEWS - Reports of a large fire at #GunwharfQuays in #Portsmouth. Latest updates on @BBCRadioSolent 96.1FM"
[[18]]
[1] "solentmotorcars: RT @BBCRadioSolent: BREAKING NEWS - Reports of a large fire at #GunwharfQuays in #Portsmouth. Latest updates on @BBCRadioSolent 96.1FM"
[[19]]
[1] "HantsChiefAlex: RT @BBCRadioSolent: BREAKING NEWS - Reports of a large fire at #GunwharfQuays in #Portsmouth. Latest updates on @BBCRadioSolent 96.1FM"
[[20]]
[1] "BBCRadioSolent: Can you see the #GunwharfQuays fire? Eye-witnesses please call - 0845 30 30 961. #Portsmouth."
> tweets <-c("marymaryw: Get an insight into how journalists operate at The News by following #dayatthenews today #pompeyhacks #portsmouth #southsea VouchAR_Ports Ł5 instead of Ł60 for 1 month of unlimited fitness classes at Outdoor Fitness Leeds - get bikini... http://t.co/BUrkjtCh #Portsmouth BillieRaePhoto RT @vintagesecret My dad has just sent me this picture. Looks like @GunwharfQuays is on fire?! #portsmouth http://t.co/HbAV7Hw0 xangma: RT @vintagesecret My dad has just sent me this picture. Looks like @GunwharfQuays is on fire?! #portsmouth http://t.co/HbAV7Hw0 vintagesecret My dad has just sent me this picture. Looks like @GunwharfQuays is on fire?! #portsmouth http://t.co/HbAV7Hw0iamnik: RT @BBCRadioSolent Can you see the #GunwharfQuays fire? Eye-witnesses please call - 0845 30 30 961. #Portsmouth. vickiredmond @MatMacAulay Best pic of#Gunwharf on fire I have seen http://t.co/8LNAiqiD #portsmouth EmilieRosa: Highs of 25 degrees on the island
 this week!! Beach time after exams I think!) #Portsmouth mYiff RT @dan_germain: RT @MatMacAulay Best pic of #Gunwharf on fire I have seen http://t.co/8LNAiqiD #portsmouth otbsaad RT @BBCRadioSolent: BREAKING NEWS - Reports of a large fire at #GunwharfQuays in #Portsmouth. Latest updates on @BBCRadioSolent 96.1FM PN_Newsdesk #Portsmouth: Ferryspeed looks to build on its past successes http://t.co/CmDglDkg PN_Newsdesk #Portsmouth More room for stalls at top Southsea school - A SOUTHSEA primary school still has room for people to se... http://t.co/ucbYWjPR VouchAR_Ports Ł14 instead of Ł30 for a pedicure with foiled transfer at Forever Young, Stoke-on-Trent - get... http://t.co/P7gJBcl8 #Portsmouth TelArnott Looking forward to #K1 today! #gym01 #portsmouth Best pic of #Gunwharf on fire I have seen http://t.co/8LNAiqiD #portsmouth dangermain RT @portsmouthnews News Large fire at Gunwharf Quays - http://t.co/s9RWpY0i #portsmouth #southsea iamnik RT
 @BBCRadioSolent BREAKING NEWS - Reports of a large fire at #GunwharfQuays in #Portsmouth. Latest updates on @BBCRadioSolent 96.1FM solentmotorcars RT @BBCRadioSolent: BREAKING NEWS - Reports of a large fire at #GunwharfQuays in #Portsmouth. Latest updates on @BBCRadioSolent 96.1FM HantsChiefAlex RT @BBCRadioSolent BREAKING NEWS - Reports of a large fire at #GunwharfQuays in #Portsmouth. Latest updates on @BBCRadioSolent 96.1FM BBCRadioSolent Can you see the #GunwharfQuays fire? Eye-witnesses please call - 0845 30 30 961. #Portsmouth")
> str_extract_all(tweets, "#[a-z//A-Z//0-9]+")
[[1]]
 [1] "#dayatthenews"  "#pompeyhacks"   "#portsmouth"    "#southsea"      "#Portsmouth"    "#portsmouth"    "#portsmouth"   
 [8] "#portsmouth"    "#GunwharfQuays" "#Portsmouth"    "#Gunwharf"      "#portsmouth"    "#Portsmouth"    "#Gunwharf"     
[15] "#portsmouth"    "#GunwharfQuays" "#Portsmouth"    "#Portsmouth"    "#Portsmouth"    "#Portsmouth"    "#K1"           
[22] "#gym01"         "#portsmouth"    "#Gunwharf"      "#portsmouth"    "#portsmouth"    "#southsea"      "#GunwharfQuays"
[29] "#Portsmouth"    "#GunwharfQuays" "#Portsmouth"    "#GunwharfQuays" "#Portsmouth"    "#GunwharfQuays" "#Portsmouth"

Please I need help.

Mariam
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