Php用正则表达式替换字符串

I want replace in my file all tags "<_tag_>" with "".
I've tried this solutions:

$_text = preg_replace('<\_\s*\w.*?\_>', '', $_text);
But I replace "<_tag_>" with "<>"
$_text = preg_replace('<\_(.*?)\_>', '', $_text);
But I replace "<_tag_>" with "<>"

How can I also select angle brackets?

It could be

<_.+?_>
# <_, anything lazily afterwards, followed by _>

In PHP:

$string = preg_replace('~<_.+?_>~', '', $string);

As in

<?php
$string = "some <_tag_> here";
$string = preg_replace('~<_.+?_>~', '', $string);
echo $string;
# some  here
?>