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<?php $pattern = '/((?<!\w)#\w+)/i'; $subject = <<<EOT Blablalb #toto zdjsdf #ho_yeah EOT; $hashtags = []; $result = preg_replace_callback('/(\s#\w+)/i', function ($matches) use (&$hashtags) { var_dump($matches); $hashtags[] = trim($matches[0]); return ''; }, $subject); var_dump($result, $hashtags, http_build_query([ 'hashtags' => implode(',', $hashtags) ]));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(6) " #toto" [1]=> string(6) " #toto" } array(2) { [0]=> string(9) " #ho_yeah" [1]=> string(9) " #ho_yeah" } string(15) "Blablalb zdjsdf" array(2) { [0]=> string(5) "#toto" [1]=> string(8) "#ho_yeah" } string(29) "hashtags=%23toto%2C%23ho_yeah"

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