unix - sed extract something from string -


I have a string "r1 / pkg / amd64 / misc / hash / hash-r1.r5218.tbz" But, I only want "hash-r1.r5218.tbz"

Therefore, I try 

  unix $ a = "r1 / pkg / amd64 / misc / hash / Hash-r1.r5218.tbz "Unix $ echo $ a | Sed 's /.* \ / \ ([^ \ \] * \) \. Tbz / \ 1 / '// [1] hash-r1.r5218 // I know that this should work unix $ ek $$ Sed 's /.* \ / \ ([^ \ /] + \) \ tbz / \ 1 /' // [2] r1 / pkg / amd64 / misc / hash / hash-r1.r5218.tbz // though I do not know why this does not work   
 As far as I remember, in regexp, the previous regexp means 1 or more times to use. * In Regexp, the previous regexp means 0 or more times to use.  
 Can anyone be understood? [2] Why failed, thank you very much   
 
 
 All code  sed  support  +  is required to specify something that supports  -r  in the regedx. But instead of  sed  using  basename  or  echo $ {a ## * /}     Why should

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