I'm guessing this is sort of what you are trying to do ;
#!perl
use strict;
my $str = '0000000NNNN00NNN0NNN0N0N0NN0N';
my @str = split '',$str;
# input
my @mask = map{ 'N' }(0..$#str);
while (<DATA>){
chomp;
my (undef,$start,$end) = split "[,\t]",$_;
for my $ix ($start..$end){
$mask[$ix-1] = ' ';
}
}
# process
my @output=();
for my $ix (0..$#str){
$output[$ix] = ($mask[$ix] eq 'N') ? 'N' : $str[$ix];
}
# output
print 'mask ',join '',@mask,"\n";
print 'string ',join '',@str,"\n";
print 'result ',join '',@output,"\n";
# intervals no,start,end
__DATA__
1,2,4
2,6,10
3,20,25
4,28,28
poj
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