function sed_bbcode_autourls($text)
{
$text = ' '.$text;

$text = preg_replace('#([\n ])(\w+?)://([^\t \n\r]+)#', '$1[url]$2://$3[/url]', $text);
$text = preg_replace('#([\n ])([\w\-_\.]+?@[\w\-]+\.[^,\t \n\r]+)#', '$1[email]$2[/email]', $text);
$text = preg_replace('#(\s)(www\.[\w\-\.]+\.\w{2,4}[^\s\r\n]*)#i', '$1[url]$2[/url]', $text);

$text = preg_replace('#(\s)(www\.[\w\-\.]+\.\w{2,4}[^\s\r\n]*)#i', '$1[url]$2[/url]', $text);