PHP Preg_replace() multiple items

Hi, im using preg_replace() on my forums for the BB codes.

Example:
$Text=preg_replace("#<b>(.*?)</b>#si", "[ B]\\1[/ B]", $Text);

now if my post has something like "[ B]this is bold[ /B]" then i get "this is bold". the problem is that its possible to put "[ B][ B]this is bold[ /B][ /B]" which gives "[ B]this is bold[ /B]".

is there a way round this without some kind of loop? maby a parameter i need to set?

Hi, im using preg_replace() on my forums for the BB codes.

Example:
$Text=preg_replace("#<b>(.*?)</b>#si", "[ B]\\1[/ B]", $Text);

now if my post has something like "[ B]this is bold[ /B]" then i get "this is bold". the problem is that its possible to put "[ B][ B]this is bold[ /B][ /B]" which gives "[ B]this is bold[ /B]".

is there a way round this without some kind of loop? maby a parameter i need to set?

Personally, for something as simple as BB code, I would use str_replace, and make a simple function to replace the elements you wish to use, and remove the ones you wouldn't want to use. For a slightly more advanced version, you could try making a simple index (delimited text file) to refer to, as to easily update the BB code.

im using preg_replace because it will only replace certain patterns and avoids replacing incomplete BB tags