php 获取图片url

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提取字符串中的图片地址[正则表达式]

$oldContent = '<p><img src="//dev.gw.woyaobaoxiu.cn/uploads/ueditor/image/20180911/153662877574057006.jpg" width="622" height="157" style="width: 622px; height: 157px;"></p><p><img src="//dev.gw.woyaobaoxiu.cn/uploads/ueditor/image/20180911/153662989034909057.jpg"></p>';
$pattern="/<[img|IMG].*?src=[\'|\"](.*?(?:[\.gif|\.jpeg|\.png|\.jpg]))[\'|\"].*?[\/]?>/";

preg_match_all($pattern, $oldContent, $match);
print_r($match);

结果显示： 

Array
(
    [0] => Array
        (
            [0] =>" 
            <img src="//dev.gw.woyaobaoxiu.cn/uploads/ueditor/image/20180911/153662877574057006.jpg" width="622" height="157" style="width: 622px; height: 157px;">
            "
            [1] =>"
            <img src="//dev.gw.woyaobaoxiu.cn/uploads/ueditor/image/20180911/153662989034909057.jpg">
            "
        )

    [1] => Array
        (
            [0] =&gt; //dev.gw.woyaobaoxiu.cn/uploads/ueditor/image/20180911/153662877574057006.jpg
            [1] =&gt; //dev.gw.woyaobaoxiu.cn/uploads/ueditor/image/20180911/153662989034909057.jpg
        )
)