my $mask_input = <INPUT>;

...

my $lastEnd = 1;

while ( <INTERVAL> ) {
    
    my (undef, $start, $end) = split '\s', $_; 

    ## change everything from the end of the last range
    ## to the start of this range to 'N'
    substr( $mask_input, $lastEnd, $start ) =~ tr[\x00-\xff][N];
    $lastEnd = $end;
    
}

...
    
print OUT "$mask_input";

[download]

Another way to do that: 

chomp( my $mask_input = <INPUT> );
my $new_mask = 'N' x length $mask_input;

...

while ( <INTERVAL> ) {
    
    my ( undef, $start, $end ) = split;
    --$start;
    substr $new_mask, $start, $end - $start, substr $mask_input, $star
+t, $end - $start;

}

...
    
print OUT "$new_mask\n";

[download]

In reply to Re: Trouble with Transliterate Function by jwkrahn
in thread Trouble with Transliterate Function by ccelt09

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.