使用简单HTML DOM获取特定文本区域

<font class="detDesc">Uploaded <b>2015-02-21 19:51:38</b>, 
 Size (7.37 MB), ULed by 
 <a class="detDesc" href="/user/FirstUploads/"
 title="Browse FirstUploads">FirstUploads</a>
</font>

hello am new to Simple HTML DOM

i want to scrape this dynamic size area -> (7.37 MB) only..

am using this code..

<?php 
 include 'simple_html_dom.php'; 
 $html = file_get_html('http://some site.com/');

 foreach($html->find('font[class=detDesc] b') as $size2) 
 { 
 $size[]=  $mysqli->real_escape_string(trim($size2->plaintext)); 
 echo $size2->plaintext.'<br>';
 } 
?>

but its giving me this -> (2015-02-21 19:51:38)..

as i want only -> (7.37 MB)

any suggestions.. ?

You need a combination of CSS and regex:

$desc = $html->find('.detDesc', 0);

if(preg_match('/\d+\.\d{2} [MKG]?B/', $desc->text(), $m)){
  echo $m[0];
}