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

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