Is it possible to calculate the size of containers on the calculator?

Question

PHP

Is it possible or is it done in some other way?

Answer 1

var text = `Text
< asd >
< asd >
<>
< asd >
<>
<>
<>`;

var total = text.match(/<.*>/gm).length;
var asd = text.match(/<\s*asd\s*>/gm).length;

console.log(`${asd}/${total}`);

Answer 2

Try starting with this:
$pattern = '#<\s*([az]+)\s*>#is';

Answer 3

Let's go,
Border + margin + padding + container body.
The border may not be taken into account if the css rule is box-sizing: border-box;