I would write 

sub{$h{$1} = $2 if /(\d+)\n\n(\w+)/}->() foreach <DATA>;

[download]
as 
/(\d+)\n+(\w+)/ and $h{$1} = $2 for <DATA>;

[download]

which I think is more readible. The modification of the regex makes it a little more robust relative to the formatting of the data. You would also lose data if there are duplicate ">or..." bits and multiline sequences.

In reply to Re^2: sorting headers in a file by hdb
in thread sorting headers in a file by utpalmtbi

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