如何用正则解析这样的字符串？

Question

形如：

$str='<p>hhhhhhhhhhhhh</p>'

$str='<h1>jjjjjjjjjjjjjjjj</h1>'

想要得到p或者h1之间的内容,怎么写？

Answer 1

$reg='#<([\w]+)>(.+?)<\/\1>#s'