Making a [code][/code] for BBcode with php regex - php

Question

I would like to make a [code][/code] tag for bbcode so that what would be inside wouldn't be taken into account by the php regex that I made.
Example :
Hello [b]newbie[/b], to write in bold, use the following : [code][b](YOURTEXT)[/b][/code]
Should return in HTML :
Hello <strong>newbie</strong>, to write in bold, use the following : [b](YOURTEXT)[/b]
Here is a view of a part of my bbcode function :
<?
function bbcode($var) {
$var = preg_replace('`\[b\](.+)\[/b\]`isU', '<strong>$1</strong>', $var);
$var = preg_replace('`\[i\](.+)\[/i\]`isU', '<em>$1</em>', $var);
$var = preg_replace('`\[u\](.+)\[/u\]`isU', '<u>$1</u>', $var);
return $var;
}
?>
Thank you in advance for your kind help !
EDIT :
Here is how I finally made it work :
<?
function bbcode($var) {
$var2 = preg_split('`(\[code].*?\[/code])`isU', $var, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
$var = preg_replace('`\[b\](.+)\[/b\]`isU', '<strong>$1</strong>', $var);
$var = preg_replace('`\[i\](.+)\[/i\]`isU', '<em>$1</em>', $var);
$var = preg_replace('`\[u\](.+)\[/u\]`isU', '<u>$1</u>', $var);
$var = preg_replace('`(\[code].*?\[/code])`isU', $var2[1], $var);
$var = preg_replace('`\[code\](.+)\[/code\]`isU', '<div>$1</div>', $var);
return $var;
}
$text = 'Hello [b]newbie[/b], to write in bold, use the following [u]lol[/u] : [code][b](YOURTEXT) [u]lol[/u][/b][/code] [b][u]LOL[/u][/b]';
echo bbcode($text);
?>
HOWEVER, there is a new problem left : if the character chain starts directly with '[code]' for example
[code][b]hello[/b][/code] test
than the result will be :
test test
This is because $var2[1] now leads to what comes after the [/code].
Could someone please help me to make a better delimitation that would also work for that second character chain ? Thank you in advance !

Answer 1

Finally, I solve all the problems I had with that :
<?
function bbcode($var) {
$var2 = getStringBetween($var, '[code]', '[/code]');
$var = preg_replace('`\[b\](.+)\[/b\]`isU', '<strong>$1</strong>', $var);
$var = preg_replace('`\[i\](.+)\[/i\]`isU', '<em>$1</em>', $var);
$var = preg_replace('`\[u\](.+)\[/u\]`isU', '<u>$1</u>', $var);
$var = preg_replace('`(\[code].+\[/code])`isU', '<div>'.$var2.'</div>', $var);
return $var;
}
function getStringBetween($str,$from,$to)
{
$sub = substr($str, strpos($str,$from)+strlen($from),strlen($str));
return substr($sub,0,strpos($sub,$to));
}
$text = 'Hello [b]newbie[/b], to write in bold, use the following [u]lol[/u] : [code][b](YOURTEXT) [u]lol[/u][/b][/code] [b][u]LOL[/u][/b]';
echo bbcode($text);
?>