public function testParseScientificNotation()
 {
     $this->assertSame('40000000', NaturalNumberSwedish::parse('400 * 10^5'));
     $this->assertSame('40000000', NaturalNumberSwedish::parse('400 * 10⁵'));
     $this->assertSame('40010000', NaturalNumberSwedish::parse('400.1 * 10⁵'));
 }
<?php

require_once __DIR__ . '/../vendor/autoload.php';
use MartinLindhe\NumberPresentation\NaturalNumberSwedish;
$val = NaturalNumberSwedish::parse('400 * 10^5');
d($val);