PHP正则表达式删除空P标签

Question

I have the following regexp, that removes BB-tags from string. But I need to remove only empty BB-tags. Can you modify my regular expression?

$message = preg_replace("#\[\/?[a-z0-9\*\+\-]+(?:=(?:".*"|[^\]]*))?(?::[a-z])?(\:$uid)\]#", '', $message);

Thank you in advance.

Answer 1

$str = '[a]asd[/a] [b][/b][c][/c]';

var_dump(preg_replace('~\[([^\]]+)\]\[/\\1\]~', '', $str));