PHP regular match specifies the beginning and end of the content & non-greedy mode

php regular matches the specified start and end content, specifies the start and end position, extracts/matches the middle content, and returns the processed string content. Non-greedy mode is used

<?php
/**
 * create by tuzwu@qq.com for 小桔灯www.xiaojudeng.com
 */
$string=&#39;My String <span class="infolist"><a class="info" href="http://www.xiaojudeng.com/">小桔灯信息网
adfadf
adsf
fgsdfg
</a></span><span>分类信息</span>&#39;; 
$string = preg_replace(&#39;/(<span class="infolist">).*?(<\/span>)/is&#39;, &#39;&#39;, $string); 
echo $string;
?>