This might get you started:
#! /usr/bin/perl
use strict ;
use warnings ;
$|++ ;
my $data = qq{
[...]
<body>
[...random stuff...]
<li>headline one</li>
<br>
<p>the story</p>
[...random stuff...]
<li>headline two</li>
<br>
<p>the next story</p>
[...random stuff...]
<body>
} ;
while ( $data =~ s{<li>(.*?)</li>.*?<p>(.*?)</p>}{}s )
{
print "Headline: $1\nStory: $2\n\n" ;
}
__END__
That is, of course, assuming that the only use for <li> and <p> are only used for headlines and stories. IMO, the more restrictive you can make this regexp, the better.
Update: This is probably better done with a proper parser. I've never used it, but HTML::Parser might be a good option.
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