The scalars returned by substr inside a block where use bytes holds, never have the utf8 flag set. For instance: 
$ perl -de 1
...
  DB<43>  $a="\x{1234}/foo"
  DB<44> x ord substr $a, 0, 1
0  4660
  DB<45> sub bsubstr { use bytes; substr $_[0], $_[1], $_[2] }
  DB<46> x ord bsubstr $a, 0, 1
0  225
  DB<47> x ord bsubstr $a, 1, 1
0  136
  DB<48> x ord bsubstr $a, 2, 1
0  180
  DB<49> x ord bsubstr $a, 3, 1
0  47

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In reply to Re^2: Common Substrings by salva
in thread Common Substrings by Anonymous Monk

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