字符匹配的问题

$str = '请问怎么在一堆源码中匹配以下字符img id="main-image" src="http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg"';$p = '#img\s*id="main-image"\s*src="(http://ecx\.images-mazon\.com/images/I/.+\.(jpg|gif|jpeg|png))"#U';preg_match($p, $str, $result) && var_dump($result);

$html = '<div><img  id="main-image" src="http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg" / alt="字符匹配的问题" ></div>';$doc = new DOMDocument();$doc->loadHTML($html);echo $doc->getElementById('main-image')->getAttribute('src');

$str='img id="main-image" src="http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg"';$p = |img id="main-image" src="(.*)"|iUs;preg_match($p, $str, $result);print_r($result);//如果你只需要对获取到的网址里那个图片名称那么你需要分割$ep=explode('/',$result[0]);echo $ep[5];