bb type code error on preg_replace

[fr8]

Altering my BBcode to be a little bit better and now im getting errors.

   $ubbs1[0] = '/\[b\]/ (.*?) /\[\/b\]/';
   $ubbs2[0] = '<b>\1</b>';

$bbcoded_message = preg_replace($text1, $text2, $message);

I get this:
Warning: preg_replace(): Unknown modifier '(' in ///*/public_html/members/pforum/f_func.php on line 162

      $ubbs1[0] = '\[b\](.*?)\[/b\]';
   $ubbs2[0] = '<b>\1</b>';

$bbcoded_message = preg_replace($text1, $text2, $message);

I get this:
Warning: preg_replace(): Delimiter must not be alphanumeric or backslash in ///*/public_html/members/pforum/f_func.php on line 162

[xblue]

In the original pattern you are trying to modify, the pattern must have been wrapped in delimiters (the first character of the pattern, repeated at the end or near the end), likely a slash.

If you add a this character within the pattern, escape it with a backslash or error #1 may occur.

Do not remove the delimiters or error #2 may occur.

[Houdini]

Try this and then you should get what you want just run it as is to see what happens basically it will echo Ha ha in bold or any text you put in $message between [ b ] and [ /b ] . Use $message=[ b ] Ha ha[ /b ] or anything you want to test, can't show it in code before the other variable assignments.

$ubbs1[0]= "#\[b\](.*?)\[/b\]#si";\\[ and ] must be escaped with \
$ubbs2[0] = "<b>\\1</b>";\\either two backslashes or \$1 to match first (.+?) match
$message = preg_replace($ubbs1, $ubbs2, $message);
echo $message;