如何从 Twitter 标签中删除 #? [英] How to remove # from Twitter hashtags?

问题描述

我想从 twitter 的哈希标签中去掉 #，所以:

I want to strip off the # from twitter hash-tags, so:

Input: I love #winter and #ice-skating
Output: I love winter and ice-skating

我认为这可以解决问题，但事实并非如此:

I thought this would do the trick, but it doesn't:

$tweet = preg_replace('/#[^\s]*/i', '${1}', $tweet);

有人可以向我解释为什么不吗?我应该改变什么?

Could somebody explain to me why not? What should I change?

推荐答案

需要将要捕获的部分用括号括起来:

You need to surround the part you want to capture in parentheses:

$tweet = preg_replace('/#([\w-]+)/i', '$1', $tweet);

在线查看:ideone

我还将正则表达式更改为更具体，但为了获得更好的正则表达式，我建议您参考此问题及其答案(对于 .NET，但该想法在 PHP 中是相同的):

I also changed the regular expression to be more specific, but for an even better regular expression I refer you to this question and its answers (for .NET but the idea is the same in PHP):

• 最佳哈希标签正则表达式

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