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  1. or download this
      DB<19> p $test
    &,&#,&#3,&#38,&#38;&,&#,&#3,&#38,&#38;
      DB<20> p $test =~ s/(&#\d+;)|&#?\d*/$1/gr
    ,,,,&#38;,,,,&#38;
    
  2. or download this
      DB<22> p ',&38,' =~ s/(&#\d+;)|&#?\d*/$1/gr
    ,,