A bit arcane, but ought to work, provided length($string) >= 3: 
  @array = unpack 'x*X3 .@0/(a4X3)', $string;

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I'd recommend Athanasius's solution though: 
  @array = $string =~ m/(?=(.{4}))/g;

[download]

In reply to Re: How can I split a string into chunks of 4 characters by oiskuu
in thread How can I split a string into chunks of 4 characters by PetreAdi

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