How to replace a tag href with php regular expression

How to regularly replace a tag href in php: First create a PHP sample file; then use the regular expression "reg_replace('/6a5ba929a32fc19e6828cc937d6d37fd/is',"65d6bb909ef2822ca65f9373106b66a9");" Just match the A tag href and replace it.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

php regular match A tag href and replace

is very simple, the code is as follows:

$file = "<a href="http://www.baidu.com">baidu</a>";
$file = preg_replace(&#39;/<a .*?href="(.*?)".*?>/is&#39;,"<a href=&#39;###&#39;>",$file);

//输出结果
<a href="###">baidu</a>

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