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<?php
$content = file_get_contents('http://www.example.com' );
// Now I must to extract all the same divs: <div class=one>div_contents</div> with their contents and save //to an array
// The problem Is i'm bad with PCRE
preg_match_all('/^<div class=one>.*<\/div>$/' , $content, $divs);
Assuming example.com has HTML that's reasonably close to valid, use DOMDocument. You can find all the DIVs, then walk through and find which ones have class=one.
Set Search Time - A google chrome extension. When you search only results from the past year (or set time period) are displayed. Helps tremendously when using new technologies to avoid outdated results.