The code that you posted appears to work fine on Windows 2000 with Activestate 5.6.1.

If you are losing carriage returns, check that they have not been chomped from string contained in $regel.

If you are generating HTML then you will need to change the substitution to add the <br> tag e.g.
$regel =~ s/Username/<br>\nGebruikersnaam/sgm;

#! /usr/bin/perl -w

use strict;
use warnings;

undef $/;
my $regel = <DATA>;
$regel =~ s/Username/\nGebruikersnaam/sgm;
print "start\n";
print "$regel";
print "end\n";
__DATA__
Username=Joe Smith
Username=Jane Doe
Gives you:
start

Gebruikersnaam=Joe Smith

Gebruikersnaam=Jane Doe
end

Inman


In reply to Re: s/// question by inman
in thread s/// question by nylon

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.