I am confused also. This appears to be a very contrived example. Can you show some code closer to your actual application?

For your regex, just keeping track of last vs curr pos would seem to do it. $ matches when pos does not advance. 

use warnings;
use strict;

my $str = "abc";
my $last_pos =0;
while ($str =~ m/.|$/gc) {
   my $curr_pos = pos($str);
   printf("1: %d", $curr_pos);
   ($curr_pos == $last_pos) ? print "  EOString\n" : print "\n";
   $last_pos = $curr_pos;
}
__END__
1: 1
1: 2
1: 3
1: 3  EOString

[download]
For character by character processing of a string, substr() and it's buddies are appropriate, not regex. An example showing more of what you are really trying to accomplish would be helpful.

In reply to Re: perl indication of end of string already matched by Marshall
in thread perl indication of end of string already matched by nachumk

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.