my $line = $_; chomp $line;
    my @chunks = unpack "(A5)*", $line;

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Just a side note: what's wrong with 
    chomp;
    my @chunks = unpack "(A5)*", $_;

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?

(or else 

while (my $line=<DATA>) { ...

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instead.)

Also, more on a stylistic personal preference ground: 

    foreach my $i (@chunks) {
    print ">" . $i . "<\n";

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why not 
    print ">$_<\n" for @chunks;

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instead?

In reply to Re^3: Split a string into items of constant length by blazar
in thread Split a string into items of constant length by Anonymous Monk

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