You show the end of "My local whois server returns output in this format:" as 

Hostname:             ns3.dom.ext

[download]

However, the end of your $resp adds two additional \ns. If I remove those from my test code (i.e. my $resp = "... ns3.dom.ext";) the output becomes: 

ns1.dom.ext ns2.dom.ext

[download]

which isn't empty but is different.

If I change the end of $regexp, in my test code, from \n) to \n?), the output returns to: 

ns1.dom.ext ns2.dom.ext ns3.dom.ext

[download]

So maybe that's something to look at in your code.

In my original response, I wrote 'See "Short, Self-Contained, Correct Example".'; I perhaps should have been more specific and written 'Please supply a "Short, Self-Contained, Correct Example".'.

If you do provide an "SSCCE" which reproduces your problem, along with expected and actual output (as opposed to vague, prosaic descriptions: "contains the expected response", "is empty" and "is fine"), I'll happily take another look. At the moment, I'm just making guesses about what you're not showing us.

You should also read, and follow the guidelines in, "How do I post a question effectively?".

— Ken

In reply to Re^3: /re/ issue - hacking Net::XWhois by kcott
in thread /re/ issue - hacking Net::XWhois by Anonymous Monk

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.