Looks like the first gets run as: 
for '0001' .. '1999'

[download]
the second as: 
for '0001' .. '1999'

[download]
and the third as: 
for '0001' .. '\'1999\''

[download]
So far as perl is concerned, it's then just a matter of understanding why those three renditions (well, two renditions actually) produce those outputs.

Here's the script I ran: 
use warnings;

for('0001' .. 1999) {print "\r$_"}
print "\n";

for('0001' .. '1999') {print "\r$_"}
print "\n";

for('0001' .. '\'1999\'') {print "\r$_"}

__END__
Outputs:
1999
1999
999999

[download]
(Btw, there's also an anomaly in your subject line ;-)

Cheers,
Rob
UPDATE: Corrected my assessment of what the first rendition did. Originally I said it was doing for '0001' .. 1999 which is incorrect - as can be seen by doing a Devel::Peek::Dump($ARGV[0])

In reply to Re: Range operator anomoly by syphilis
in thread Range operator anomaly by BrowserUk

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.