Hi monks I'm having trouble with Regex. I want to extract data between 3th comma and 4th comma.I try to use bellow code:

while (<DATA>) {
/^.*?,.*?,.*?,(.*?),/;
print "$1\n";
}
__DATA__
6,0,3,"8.1",1
7,578,,"8.2,r1",1
8,0,5,"8.2,r3",1
18,0,13,"6.2",1
19,D610,,"6.3,r1",1
20,2f78,15,"6.3,r2",1

[download]
But it failed,because some string like "6.3,r1" include comma!Someone tell me to use (?key).Is it right?

Thanks a lot! UPDATE: correct a stupid mistake in code as bart's reply.

In reply to Nth match. by xiaoyafeng

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.