BB Code Parser

[Kol]

Hi there!

I am trying to make a function to parse BB Code. I would be able to make a simple one, e.g. replace [img] with <img src=" and [ /img] with "> etc.

However, this could cause problems if the tags are not completed. For example, if the user only typed in and did not close it, this would be replaced with <b> which would not be closed, thereby making the entire page bold, or underlined, or a link etc.etc.

How would i be able to get around this? or are there any functions currently available which i could use/look at/edit?

My initial idea was to find the number of closed tags (& replace them), then replace that number of opening ones.

Any ideas??

Thanks!!

[Kol]

I have found this code:

$msg = preg_replace("/\[u\](.*?)\[\/u\]/si","<u>\\1</u>",$msg);

It works, but would anyone please mind explaining exactly what it does? I get the idea behind it, but all the \/\/\/\//\/ has confused me lol.

Thanks