How to get values inside of brackets according to BODMAS rule

Question

I tried and stuck to this formula which only only work on 1 pair of brackets:

preg_match('#\((.*?)\)#', $text, $match);
print $match[1];

What I want to do is parse the text after the last open parenthesis before the first close parenthesis.

For example, I have equation like this:

1+(2+(3+(5-6)))+(7-8)

The text that would be parsed is "5-6".

Answer 1

Match ( > anything except ( or ) > )

$text = '1+(2+(3+(5-6)))+(7-8)';
preg_match('/\(([^\(\)]+)\)/', $text, $match);
var_dump($match);