From your description, this should be close to what you want: 

my $newseq = do { local $/; <INFILE> };

$newseq =~ tr/01//cd;
$newseq =~ tr/0/a/;
$newseq =~ s/(1+)/ chr length( $1 ) + ord 'a' /eg;

print "$_\n" for $newseq =~ /.{0,80}/g

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In reply to Re: length of 1's by jwkrahn
in thread length of 1's by coldy

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