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  1. or download this
    s{(^)?\s+(\z)?}{ defined $1 || defined $2 ? '' : ' ' }gex
  2. or download this
     $ perl5.8.3 -del
  DB<1> x "hi" =~ /i\z/
...
  DB<1> x "hi" =~ /(i)(\z)?/
0  'i'
1  ''