Hi can you help me to grab a portion of webpage via regex. Below is what I am trying to do

<div class="fk-srch-item fk-inf-scroll-item"> 
    <div class="line fksd-bodytext "> 
    <div class="unit left fk-sitem-image-section"> 
        <div class="line"> 
            <div class="unit num fksd-smalltext"> 
                                    <span class="sno-div">1.</span> 
                            </div> 
            <div class="lastUnit rposition"> 
                <a href="/software-engineering-practitioner-s-approach
+-7th/p/itmczynwvwmjatgq?pid=9780071267823&query=Roger+Pressman&srno=s
+_1&ref=1d31579d-d54b-4c3e-8abf-100b33486a91&otracker=from-search"> 
                                    <img onerror="img_onerror(this);" 
+data-error-url="http://img1.flixcart.com/img/thumb/book.jpg" height="
+100" width="100" data-src="http://img7.flixcart.com/image/book/8/2/3/
+software-engineering-a-practioner-s-approach-100x100-imad96yhpzgnapyz
+.jpeg" src="http://img6.flixcart.com/www/prod/images/gray_1x1-8185705
+5.gif" onload="lzld(this)" alt="Buy Book Software Engineering : A Pra
+ctitioner's Approach 7th Edition by " title="Software Engineering : A
+ Practitioner's Approach 7th Edition by "></img>                </a> 
            </div>
        </div> 
            </div> 
    <div class="line bmargin10"> 
            <h2 class="fk-srch-item-title fksd-bodytext unboldtext"><a
+ href="/software-engineering-practitioner-s-approach-7th/p/itmczynwvw
+mjatgq?pid=9780071267823&query=Roger+Pressman&srno=s_1&ref=1d31579d-d
+54b-4c3e-8abf-100b33486a91&otracker=from-search" class="fk-srch-title
+-text fksd-bodytext">Software Engineering : A Practitioner's Approach
+ 7th Edition (Paperback)</a></h2> 
         <span class='fk-item-authorinfo-text fksd-smalltext'>by <a hr
+ef="/author/roger-pressman?query=Roger+Pressman&vertical=books&otrack
+er=from-search"><b>Roger</b> <b>Pressman</b></a></span>
[download]

below is code I am currently using to fetch the portion.

while($page =~m/class="lastUnit.*\n.*\s+.*\n.*\n.*\n.*\n/ig) { 
     print "sample Text\n"
}
[download]

The code is currently used to fetch a portion of page from class = lastUnit to class = line margin10
can anyone suggest a good regex for selecting the above section