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  1. or download this
    use strict;
    my $str = 'a,b,c,d,e,f,g,h,i,j,k,l,m,n';
    print "$str\n";
    ...
    $str =~ s/(.)/$i++;($1 ne ',' or $i>15 && $i<25) ? $1 : '#'/ge;
    
    print "$str\n";
    
  2. or download this
    a,b,c,d,e,f,g,h,i,j,k,l,m,n
    a#b#c#d#e#f#g#h,i,j,k,l,m#n