用正则表达式替换图像

Question

I want to find and do some operations on this string:

<img src="images/video.png" border="0" alt="60" />

1. Find every occurence in context
2. Retrieve the alt attribute (in this case 60) and work with this number
3. Replace the whole image

I've been playing around with regular expressions but it obviously doesn't work yet:

    if (preg_match_all('<img src="images/video.png" border="0" alt="[^"]*">', $content, $regs)) {
    for($i=0;$i<count($regs[0]);$i++){

        echo $regs[0][$i] . "<br>";
        $id = preg_replace('alt="[^"]*"', "$1", $regs[0][$i]);
        echo "The id: " . $id . "<br>";

    }
}

Answer 1

You should use DOM to parse XML/HTML...