PHP：正则表达式处理微博中的话题和对象名

$post_content = "@oschina和@twitter在研究用#PHP#的#正则表达式#过滤话题和对象名";

$tag_pattern = "/\#([^\#|.]+)\#/";
preg_match_all($tag_pattern, $post_content, $tagsarr);
$tags = implode(',',$tagsarr[1]);

$user_pattern = "/\@([a-zA-z0-9_]+)/";
$post_content = preg_replace($user_pattern, '@$程序猿闯子', $post_content );
$post_content = preg_replace($tag_pattern, '#$程序猿闯子#', $post_content);