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DB<13> $str = "I don't think 'don't' isn't >

  DB<14> x split /\b{wb}/, $str
...
13  ' '
14  'word'
  DB<15>

  DB<27> $str = "I don't think, 'don't' isn't  a   word..."

...
5  'a'
6  'word'
  DB<30>