宽x高的正则表达式

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I am creating a php script to drag a recommendation from https://gtmetrix.com/reports/example.com/a_unique_code, strip the image and recommended image width and height then optimize my image automatically. A scrap script I have so far is as follows;

$content = file_get_contents('https://gtmetrix.com/reports/example.com/a_unique_code');

$pattern = '~<ul>(.*?)</ul>~s';

preg_match_all($pattern, $content, $out);
preg_match_all($pattern, $out[0][0], $out);
$j=0;

foreach($out[0] as $array)
{
    $str_arr = preg_split ("/<li>/", $array);  
}

foreach($str_arr as $string)
{
    $regex = '/https?\:\/\/[^\",]+/i';
    preg_match_all($regex, $string, $urls);
    $regex = '\s(\d+)[a-zA-Z](\d+)\s';
    preg_match_all($regex, $string, $sizes);
    echo "<pre>";
    echo $urls[0][0].' ';
    var_dump($sizes);
    //echo ''.strip_tags($string).'<br/><br/>';
}

给定以下字符串，提取URL和第二个图像尺寸的正则表达式将是什么？

string = 'https://www.example.com/0029.jpg is resized in HTML or CSS from 300x623 to 123x200. Serving a scaled image could save 51.3KiB (86% reduction).';

旁注，我将以原型形式对其进行优化。