I am using the following to extract data with a {{Infobox ... }} block, with the catch being that there might be {{ ... }} blocks within it: 

use strict   ;
use warnings ;

use Data::Dump qw( dump ) ;


my @data = <DATA> ;
my $data = join( '', @data ) ;

my @info_box_contents ;
while( $data =~ m/(
                     {{Infobox
                         .*?
                         ({{(?=}}))?
                         .*?
                      }}
                     )/xsg ) {
    print STDERR "MATCHED\n";
    push @info_box_contents, $1 ;
}

dump( \@info_box_contents ) ;




__DATA__
{{Infobox
 text text text 
 {{text text text 
 text {{text text}}
 text}} 
 {{{text {{text }} 
    text }}}
}}
blah blah 
blah blah 
blah blah 
{{Infobox
 text1 text1 text1 
 {{text1 text1 text1 
 text1 {{text1 text1}}
 text1}} 
 {{{text1 {{text1 }} 
    text1 }}}
}}
{{Infobox one}}

[download]

I get the following output: 

MATCHED
MATCHED
MATCHED
[
  "{{Infobox\n text text text \n {{text text text \n text {{text text}
+}",
  "{{Infobox\n text1 text1 text1 \n {{text1 text1 text1 \n text1 {{tex
+t1 text1}}",
  "{{Infobox one}}",
]

[download]

I am expecting it to match the entire block up to the first mismatched '}}'

Whats more if I remove the '?' from my look-ahead and change that line from  ({{(?=}}))? to  ({{(?=}})) I match nothing.

Help will be greatly appreciated.

In reply to RegEx - Positive Look-ahead by tmharish

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.