R regex to parse token after @ also with no additional tokens in string -

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I have a problem parsing the address in the text string. The usual address will be "@edder token token token" or "@edder token token / NTOn". 

  string & lt; - c ("@ address token token token", "@ address token token / ntoken") gsub ("^ \\.? @ ([A-z0- 9_] {1,25}) [^ a-z0- 9 _] +. * $ "," \\ 1 ", string)   
 is correctly parsed  
  [1]" address "Address"   
 So far, in some cases the address string will be the only token, then regex @  
  string & lt; - c ("@ address token token token", "@ address token token / ntoken", "@address") gsub ("^ \\.? @ ([A-z0- 9_] {1,25}) [ ^ A-z0- 9 _] +. * $ "," \\ 1 ", string) # [1]" address "" address "" @ eddy "  
 one-token How to instruct regex to manage the case   
 
 
 
 In some cases address string The only token will be, then the address will return with the regex @   
 Because there is no match in that situation.  
 Just make a small difference:  
 Convert  [^ a-z0- 9_] +  in  [^ a-z0- 9_] ?  to make it  optional   
  ^ \. @ ([A-z0- 9_] {1,25}) [^ a -z0-9 _] ?. $$   
 this is

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