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  1. or download this
     $ echo bbbaaabbb | sed -e 's/\(b*\)/(\1)/g'
(bbb)()a()a()a(bbb)
 $
  2. or download this
     $ echo bbbaaabbb | sed -e 's/\(b*\)/(\1)/g'
(bbb)a()a()a(bbb)
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  3. or download this
     $ echo bbbaaabbb | perl -pe 's/(b*)/(\1)/g'
(bbb)()a()a()a(bbb)()
() $ echo bbbaaabbb | perl -lpe 's/(b*)/(\1)/g' >
(bbb)()a()a()a(bbb)()
 $
  4. or download this
    [bbaabb]
(bb)
...
 ....()
 .....()
[bbaabb]
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    [bbaabb]
()
...
 ....(b)
 .....()
[bbaabb]