PHP正则匹配图片

$pattern='/<img.*?(?: |\\t|\\r|\\n)?src=[\'"]?(.+?)[\'"]?(?:(?: |\\t|\\r|\\n)+.*?)?>/sim';
preg_match_all($pattern, $content, $match, PREG_PATTERN_ORDER);

$content：要匹配的字符串
$match：匹配的结果数组