dongyishen5796 2014-10-11 22:35
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使用PHP在字符串中抓取以@开头的单词[关闭]

When a user posts a comment, I want to grab every word that starts with a @ symbol.

ex. string is 'Check this out @user1. It's a photo of @user2 and @user3.'

When I'm on the PHP side, I want to grab user1, user2, user3 so I can then notify those users that they have been tagged in this comment.

I tried playing with strpos, but closest I got was if the string started with @ using the logic below.

if (0 === strpos($string, '@')){ echo 'yes' }

but that wasn't what I needed.

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  • dongwen7813 2014-10-11 23:50
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    You can simply use this function:

    function get_tagged_users($comment) {
        $matches = array();
        if (preg_match_all('/@(\w+)\b/', $comment, $matches)) {
            return $matches[1];
        }
        return array();
    }
    

    It will return an array of usernames (without "@") and an empty array if no matches found or if an error occurred while doing regex.

    Note: It uses regular definition of word boundaries and words. Lorem @ipsum-ed dolor will return just ipsum.

    So if you need to include hypen (-) in usernames, just change regex with /@([-\w]+)\b/

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