查找和替换@提及的正则表达式，例如twitter [英] Regular expression to find and replace @ mentions like twitter

问题描述

我正在开发一个PHP应用程序，该应用程序需要一个正则表达式来替换诸如twitter之类的@提及.正则表达式还应满足以下需求.

I am developing a PHP application which needs a regular expression to replace the @ mentions like twitter. Also the regular expression should satisfy the following needs.

1. 如果只有@并且前后没有任何内容，则不应替换.
电子邮件中的
2. @不应替换.例如. [e-mail]不应替换.
3. 仅应替换@sam或@example之类的字符串，例如<a href="http://twitter.com/sam">@sam</a>和<a href="http://twitter.com/example">@example</a>

1. if there is just @ and nothing before and after that then it should not be replaced.
2. @ in the emails should not be replaced. For eg. [e-mail] should not be replaced.
3. Only strings like @sam or @example should be replaced like <a href="http://twitter.com/sam">@sam</a> and <a href="http://twitter.com/example">@example</a>

请帮助.预先感谢.

推荐答案

哇.我自己找到了答案.

Wow. I found the answer myself guys.

$tweet = preg_replace('/(^|[^a-z0-9_])@([a-z0-9_]+)/i', '$1<a href="http://twitter.com/$2">@$2</a>', $tweet);

感谢您的帮助.

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