php 正则表达式或 |操作员 [英] php regex or | operator

问题描述

我正在做一个 preg_replace:

I am doing a preg_replace:

$pattern = '/<ul>/';
$replacement = "";
$string = "hello <ul> how are you doing </ul>";
echo preg_replace($pattern, $replacement, $string);

这将用 "" 替换我的

但我想替换任何
或 </ul>，我不知道如何使用 |(或)字符.

That will replace my <ul> with "" but Id like to replace anything that is a <ul> or </ul>, I am not getting how to use the | (or) character though.

我是这样尝试的，但效果不佳:

I try like this, but it is not working right:

$pattern = '/<ul>|</ul>/';
$replacement = "";
$string = "hello <ul> how are you doing </ul>";
echo preg_replace($pattern, $replacement, $string);

肯定会感谢任何帮助

谢谢，布莱恩

推荐答案

您可能需要像这样对/ul 中的斜杠进行转义:

You may need to escape the slash in /ul like this:

$pattern = '/<ul>|<\/ul>/';

或者这样做，不确定它是否会起作用:

or do this, not sure if it'll work:

$pattern = '/<\/?ul>/';

('?' 表示前面的零个或一个字符，在本例中为 '/'.)

(the '?' means zero or one of the previous characters, which is '/' in this case.)

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