I'm wondering why you add the complication of an inner anonymous array and a three-argument split. I think neither are necessary and, since split defaults to operation on $_ one argument suffices.

print for
   map  { $_->[ 0 ] }
   sort { $a->[ 1 ] <=> $b->[ 1 ] || $a->[ 2 ] <=> $b->[ 2 ] }
   map  { [ $_ , ( split m{,} )[ 1, 0 ] ] }
   <DATA>;

[download]

You could also use a Guttman Rosler transform.

print for
   map { substr $_, 8 }
   sort
   map { pack q{NNA*}, ( split m{,} )[ 1, 0 ], $_ }
   <DATA>;

[download]

I hope this is of interest.

Cheers,

JohnGG

In reply to Re^2: numeric sort on substring by johngg
in thread numeric sort on substring by Anonymous Monk

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