案例代码：
<p><img src=\\\"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1596546745835&di=22c349312e299fe8af8040c679e7e01b&imgtype=0&src=http%3A%2F%2Fmedia-cdn.tripadvisor.com%2Fmedia%2Fphoto-s%2F01%2F3e%2F05%2F40%2Fthe-sandbar-that-links.jpg\\\" title=\\\"图3.png\\\" alt=\\\"图3.png\\\" oldsrc=\\\"W020200731477969213655.png\\\" </img></></p>";
”
正则表达式
<img[\s+]src=.*?(\/>|\<\/img>)
运行结果
共找到 1 处匹配：
<img src=\\\"https://data.stcn.com/djsj/202007/W020200731477969213655.png\\\" title=\\\"图3.png\\\" alt=\\\"图3.png\\\" oldsrc=\\\"W020200731477969213655.png\\\" </img>
