Detect csv delimiter

script.php

<?php

class UnsupportedDelimiter extends \Exception
{
}

class Csv
{
    public function __construct(string $csv)
    {
        $this->raw = $csv;
    }
    
    public function getDelimiter()
    {
        if (preg_match("/^\w*,/", $this->raw)) {
            return ',';
        } elseif (preg_match("/^\w*;/", $this->raw)) {
            return ';';
        }
        
        throw new UnsupportedDelimiter("Could not detect valid delimiter");
    }
}

$csvFile ="name;email;xxx
aaaa;[email protected];kjns
";

$csv = new Csv($csvFile);
echo $csv->getDelimiter(); // ;

$csvFile2 ="name,email,xxx
aaaa,[email protected],kjns
";

$csv2 = new Csv($csvFile2);
echo $csv2->getDelimiter(); // ,