Mine

function bb2html($str){    $str = htmlspecialchars($str, ENT_NOQUOTES);    $find = array('#\[ ?b *\](.+)\[ ?/b *\]#isU',        '#\[ ?i *\](.+)\[ ?/i *\]#isU',        '#\[ ?u *\](.+)\[ ?/u *\]#isU',        '#\[ ?s *\](.+)\[ ?/s *\]#isU',        '#\[(colou*r)=([a-z0-9]*)\](.*)\[\/\1\]#isU',        '#\[ ?quote *\](.+)\[ ?/quote *\]#isU',        '#\[ ?list *\](.+)\[ ?/list *\]#isU',        '#\[ ?\* *\](.+)#isU',        '#\[(size)=([0-9]*)\](.*)\[\/\1\]#isU',        '#\[(quote)=([a-z0-9]*)\](.*)\[\/\1\]#isU',        '#\[ ?code *\](.+)\[ ?/code *\]#isU',        '#\[ ?img *\](.+)\[ ?/img *\]#isU',        '/^.*\[url=(https?:\/\/)([^\]]*)\].*\[\/url\].*$/',        '/^.*\[url=([^\]]*)\].*\[\/url\].*$/');    $replace = array('<b>\1</b>',        '<i>\1</i>',        '<u>\1</u>',        '<s>\1</s>',        '<span style="color: \2">\3</span>',        '<table width="100%" bgcolor="lightgray"><tr><td bgcolor="white">\1</td></tr></table>',        '<ul>\1</ul>',        '<li>\1',        '<span style="font-size: \2">\3</span>',        '<table style=padding-left:30px cellspacing="1" cellpadding="3" width="100%" border="0" align="center"><tr><td><b>\2 wrote:</b></td></tr><tr><td  bgcolor="#E7E7F2"><br />\3<br /></td></tr></table></$        'Code:<table style=padding-left:30px width="100%"><tr><td bgcolor="white"><code>\1</code></td></tr></table>',        '<img src="\1" />',        '<a href="\1\2">\3</a>',        '<a href="http://\2">\3</a>',);