How to replace a tag with php regular expression

How to implement php regular replacement of a tag: first create a PHP sample file; then use the regular expression "preg_replace('/6a5ba929a32fc19e6828cc937d6d37fd/is',"65d6bb909ef2822ca65f9373106b66a9",$file);" Just replace the a tag.

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php regular match A tag href and replace

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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