You have two sets of parentheses in your regular expression that are mutally exclusive. Perl is putting the contents of both $1 and $2 into your array. Since one of those will be undef, perl complains. Rewrite your RE such that there is only one set of parentheses or be sure to discard the undefs.

Update: here's one possibility: 

#!/usr/bin/perl

use strict;
use warnings;

my $inp = 'AAA * BBB CCC * * "2000 01 00 00 00" "2004 01 00 00 00"';
my @r = $inp =~ /("[^"]*"|\S+)/g;
s/\A"(.*?)"\z/$1/ for @r;
$, = "\n";
print @r, "\n";

[download]

duff

In reply to Re: split string using regex by duff
in thread split string using regex by jeanluca

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.