<?php

    $text = '<a href="http://f...content-available-to-author-only...m.ae/cameras-photo/digital-cameras/samsung-es95-white"><img id="img_28300"';
    $regex = '~<a href="http://f...content-available-to-author-only...m.ae/cameras-photo/digital-cameras/samsung-es95-white"><img id="img_(.*?)"~mis';
    var_dump($regex);
    var_dump( preg_match($regex, $text) );